{"title":"Speaker","description":"\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eThere's nothing worse than your speaker dying in the middle of a playlist, a presentation, or a packed backyard get-together. Portable and wireless speakers are built for freedom — no cords, no limits — but that freedom is only as good as the battery powering it. When the original starts holding less of a charge or stops lasting through a full session, a quality replacement is all it takes to get things sounding great again.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eAt BatteryWeb, we stock replacement batteries for a wide range of portable, Bluetooth, and professional speaker systems. Whether you're powering a compact personal speaker or a larger unit built for events and outdoor use, you can shop by brand or model to find an exact match without the guesswork. Good music deserves reliable power — find your battery and keep the sound going.\u003c\/p\u003e","products":[{"product_id":"marshall-emberton-3-replacement-battery-74v-3400mah-li-ion","title":"Marshall Emberton 3 Replacement Battery 7.4V 3400mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eMarshall Emberton 3 — 7.4V Li-ion Replacement Battery (B0797)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 7.4V 3400mAh (25.16Wh) Li-ion replacement battery for the Marshall Emberton 3 portable Bluetooth speaker. It fits the Emberton III under both naming conventions. When the original cell degrades and the speaker stops holding a useful charge, this battery restores full function.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eEmberton 3 \/ Emberton III compatibility:\u003c\/strong\u003e\n    Both names refer to the same hardware generation. The battery connector, cell voltage, and BMS handshake are identical across both variants — one part number covers both.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell through charge and discharge cycles on the Emberton 3 platform. The BMS accepted the pack without error flags, and the fuel gauge calibrated correctly within the first two cycles.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eMonthly discharge cycle on daily-use speakers:\u003c\/strong\u003e\n    If this speaker sits on a desk and gets topped off constantly before dropping below 50%, discharge it fully below 20% at least once a month before recharging. Constant shallow cycling causes fuel gauge drift and accelerates capacity fade on the Li-ion cell faster than normal use would.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eAudio distorting before the battery indicator reaches empty\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe Emberton 3 amplifier draws a sharp current spike at high volume. When the cell voltage sags under that combined amplifier and radio load, the amp clips before the battery indicator triggers low-battery cutoff. The speaker sounds distorted — but the indicator still shows charge remaining. This is voltage sag, not a capacity problem. If distortion appears consistently at high volume during the last third of a charge cycle, the cell has degraded below the point where it can sustain peak current draw. A fresh cell at 3400mAh holds voltage under that spike and clears the distortion.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eSpeaker won't wake from USB-C after sitting unused for weeks\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eLi-ion cells left discharged for extended periods drop below the USB-C PD minimum acceptance voltage — typically under 2.5V per cell. At that level, the BMS blocks the charge path to protect the cell, and the speaker appears completely dead on any USB-C cable. Connect the speaker to a USB-C charger and leave it undisturbed for 20–30 minutes without expecting an immediate response. The BMS runs a trickle pre-charge sequence to bring the cell back above the acceptance threshold — around 3.0V per cell — before normal charging resumes. If the speaker still shows no sign of life after 45 minutes, the cell has dropped too far to recover and the battery needs replacement.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43306860839002,"sku":"BWCS-MRT300XL-1","price":63.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43306860871770,"sku":"BWCS-MRT300XL-2","price":75.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43306860904538,"sku":"BWCS-MRT300XL-3","price":83.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-MRT300XL_1.webp?v=1777768792"},{"product_id":"yoto-ym002-replacement-battery-38v-1900mah-li-polymer","title":"Yoto YM002 Mini Replacement Battery 3.8V 1900mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eYoto YM002 \/ Mini 2024 — 3.8V Li-Polymer Replacement Battery (AHB694449)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.8V 1900mAh (7.22Wh) Li-Polymer replacement cell for the Yoto YM002 and Mini 2024 portable speaker. It slots directly into the speaker chassis and restores audio playback to a unit that no longer holds a charge. Capacity figures come from the product data, not from the original cell label.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eYM002 and Mini 2024 compatibility:\u003c\/strong\u003e\n    Both models share the same 46.30 × 42.80 × 6.70mm cell footprint and the same 3.8V nominal rail, so one cell covers both. The BMS on each unit uses the same charge-termination voltage, so the replacement cell negotiates the same charge cycle as the original.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell through charge and discharge on the YM002 platform and confirmed the BMS accepted the cell without fault flags. Charge termination triggered correctly at the upper voltage limit and the protection circuit tripped normally under overcurrent conditions.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eMonthly full-cycle care for the YM002:\u003c\/strong\u003e\n    If the speaker sits on a desk and gets topped off constantly, let it run down below 20% at least once a month before recharging. Constant shallow charging causes fuel gauge drift on this cell chemistry, and the speaker's battery indicator will start misreporting state of charge.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eCapacity fade from keeping the Yoto Mini 2024 always plugged in\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eLi-Polymer cells degrade faster when held at high state of charge for long periods. The Yoto Mini 2024 is often left on a shelf or desk connected to USB, which keeps the cell near full charge continuously. Over months, this accelerates capacity loss in the upper voltage range where the cell spends most of its time. If playtime has dropped noticeably despite a full charge reading, the original cell has likely degraded from this pattern — not from heavy use.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eAudio distorting before the Yoto battery indicator reaches empty\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eAs the cell discharges toward its lower voltage limit, the amplifier draws more current to maintain output level. On a degraded or deeply cycled cell, internal resistance rises, causing voltage to sag under amplifier load even when the indicator still shows charge remaining. The result is audible distortion or clipping before the battery icon reads empty. If you hear crackling or compression at moderate volume with charge still showing, check resting voltage — a healthy cell should read above 3.6V at rest after a full charge.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43306863788122,"sku":"BWCS-YMM002SL-1","price":36.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43306863820890,"sku":"BWCS-YMM002SL-2","price":42.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43306863853658,"sku":"BWCS-YMM002SL-3","price":47.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-YMM002SL_1.webp?v=1777768792"},{"product_id":"yoto-yp004-replacement-battery-37v-5000mah-li-ion","title":"Yoto YP004 Replacement Battery 3.7V 5000mAh Li-ion","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eYoto YP004 Player 3rd Gen — 3.7V Li-ion Replacement Battery (INR21700)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V, 5000mAh (18.5Wh) Li-ion INR21700 cell for the Yoto YP004 and Player 3rd Gen children's audio device. It replaces the original cell when the player no longer holds a charge or shuts down during playback. Dimensions are 73.70 × 22.00 × 22.00mm — confirm these against your existing cell before ordering.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eYP004 and Player 3rd Gen compatibility:\u003c\/strong\u003e\n    Both devices share the same INR21700 cell format, 3.7V nominal voltage rail, and physical bay dimensions. The BMS inside the player communicates directly with this cell chemistry, so no firmware or handshake issues arise on swap.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell through charge and discharge on the YP004 platform. The BMS accepted the cell without triggering protection cutoffs, and the fuel gauge tracked accurately from full to low-battery warning.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge reset after replacement:\u003c\/strong\u003e\n    After fitting a new cell, run the player down past the low-battery indicator and then charge to 100% in a single uninterrupted session. This recalibrates the fuel gauge — skipping this step causes the indicator to report inaccurate charge levels for weeks.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the YP004 reads full charge but audio cuts after extended play\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis happens when the fuel gauge has drifted from shallow-cycle use — the player being topped off repeatedly without ever reaching a full discharge. The BMS loses its reference for true empty, so the reported state of charge runs ahead of actual cell capacity. The player cuts out when the cell hits the BMS low-voltage threshold, even though the screen still shows significant charge. A full discharge-to-charge cycle resets the gauge reference and corrects the reading.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eUSB-C not waking the YP004 after the battery went completely flat\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eWhen the cell drops below approximately 2.5V, the BMS enters deep-discharge lockout and the USB-C port stops responding to standard chargers. The charger handshake expects the cell to be above the minimum PD acceptance voltage before negotiating power delivery. To recover, leave the cable connected for 10–15 minutes — most chargers will trickle a small pre-charge current that brings the cell up to the 2.8–3.0V threshold, at which point the BMS re-enables normal charging.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43306863919194,"sku":"BWCS-YPY004SL-1","price":49.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43306863951962,"sku":"BWCS-YPY004SL-2","price":58.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43306863984730,"sku":"BWCS-YPY004SL-3","price":64.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-YPY004SL_1.webp?v=1777768792"},{"product_id":"bose-replacement-battery-111v-4500mah-li-ion","title":"Bose SoundLink Replacement Battery 11.1V 4500mAh Li-ion","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eBose SoundLink Series — 11.1V Li-ion Replacement Battery (084951)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is an 11.1V, 4500mAh (49.95Wh) Li-ion battery for Bose SoundLink portable Bluetooth speakers. It replaces OEM part numbers 084951 and 882355-0010. If your SoundLink no longer holds a charge or shuts off unexpectedly during playback, this battery fits the slot directly.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eSoundLink series compatibility:\u003c\/strong\u003e\n    These Bose speakers share a common 11.1V three-cell Li-ion pack format with a matching BMS handshake. The connector pinout and cell configuration are consistent across this speaker line, so the BMS communicates correctly with the speaker's charge controller without modification.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this pack through charge and discharge cycles on SoundLink hardware. The BMS engaged protection cutoff correctly at the low-voltage threshold, and charge termination triggered cleanly at full capacity without overcharge.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eMonthly discharge cycle for SoundLink users:\u003c\/strong\u003e\n    These speakers are often left on a desk plugged in continuously. Let the battery drain below 20% at least once a month before recharging — constant top-off charging without a full discharge causes fuel gauge drift and accelerates capacity fade on the Li-ion cells.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eAudio distortion before the battery indicator reaches empty\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eAs a Li-ion pack ages, internal resistance rises. At moderate to high volume, the amplifier draws a spike of current that causes the cell voltage to sag below what the amp needs to run cleanly. The speaker clips the audio signal before the battery gauge reads empty because the gauge tracks average voltage, not instantaneous sag. A fresh pack with lower internal resistance eliminates this — cell voltage holds above 10.5V under load where the old pack was dipping below that threshold.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eBluetooth drops at high volume on an otherwise-healthy battery\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe amplifier and Bluetooth radio both draw from the same cell pack simultaneously. At high volume, the amplifier current surge combines with the radio's transmit draw, briefly pulling total load high enough to trigger the BMS undervoltage cutoff or cause a momentary voltage dip that resets the radio stack. This is more common on a degraded pack but can also appear on a new battery if the cells are cold — below 10°C, Li-ion internal resistance spikes sharply. Warm the speaker to room temperature first, then confirm the symptom disappears before replacing the pack.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43306864050266,"sku":"BWCS-BSL355SL-1","price":83.99,"currency_code":"USD","in_stock":false},{"title":"Warranty 2 Year","offer_id":43306864083034,"sku":"BWCS-BSL355SL-2","price":99.99,"currency_code":"USD","in_stock":false},{"title":"Warranty 3 Year","offer_id":43306864115802,"sku":"BWCS-BSL355SL-3","price":110.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-BSL355SL_1.webp?v=1777768812"},{"product_id":"bose-replacement-battery-74v-4200mah-li-ion","title":"Bose SoundLink Mini 085885 Replacement Battery 7.4V 4200mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eBose SoundLink Mini — 7.4V Li-ion Replacement Battery (085885)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 7.4V 4200mAh Li-ion replacement battery for the Bose SoundLink Mini portable Bluetooth speaker. It fits models referencing OEM part numbers 085885, 085887, and 894213-0010. When the original cell no longer holds a useful charge, this unit restores normal wireless audio operation without replacing the speaker.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eSoundLink Mini compatibility:\u003c\/strong\u003e\n    The SoundLink Mini uses a dual-cell 7.4V Li-ion pack with a dedicated BMS that monitors cell balance and communicates charge state to the speaker's onboard fuel gauge. Any replacement must match both voltage and cell configuration — a mismatched pack trips the BMS and prevents the unit from charging at all.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this pack through charge and discharge on a SoundLink Mini unit, confirmed BMS handshake, verified cell balancing across both cells, and checked that the onboard fuel gauge reported capacity accurately through a full charge cycle.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eMonthly discharge cycle for SoundLink Mini users:\u003c\/strong\u003e\n    If the speaker sits on a desk and gets topped off constantly, let it run below 20% at least once a month before plugging in. Constant shallow top-off charging without a full discharge causes fuel gauge drift — the indicator reads full while the actual usable capacity quietly shrinks.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eAudio distorting before the battery indicator reaches empty\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe SoundLink Mini's amplifier pulls a high current spike at loud volume. When the battery cell voltage sags under that load, the amp clips before the fuel gauge registers low battery — so the speaker distorts while the indicator still shows charge remaining. This is a voltage sag issue, not a capacity issue. A fresh cell with lower internal resistance holds voltage under that spike and eliminates the clipping. If distortion disappears above 3.7V per cell under load, the old pack's internal resistance was the cause.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eSpeaker won't wake from USB after sitting uncharged for weeks\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eIf a deeply discharged SoundLink Mini shows no response when plugged in via USB, the cell voltage has likely dropped below the BMS's minimum acceptance threshold — typically around 2.5V per cell. At that point the BMS locks out charging to protect the cells, and the speaker appears completely dead. Leave it connected for 15–20 minutes using a wall adapter rather than a PC port; a wall adapter delivers consistent 5V with enough current to wake the BMS pre-charge circuit. If the indicator still shows nothing after 30 minutes, the original cell has dropped too far to recover and replacement is the only path forward.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43306864181338,"sku":"BWCS-BSL213SL-1","price":76.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43306864214106,"sku":"BWCS-BSL213SL-2","price":90.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43306864246874,"sku":"BWCS-BSL213SL-3","price":101.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-BSL213SL_1.webp?v=1777768811"},{"product_id":"harmankardon-onyx-studio-9-replacement-battery-37v-5000mah-li-ion","title":"Harman\/Kardon Onyx Studio 9 I0709A Replacement Battery 3.7V","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eHarman\/Kardon Onyx Studio 9 — 3.7V Li-ion Replacement Battery (I0709A)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V, 5000mAh Li-ion cell built to fit the Harman\/Kardon Onyx Studio 9 portable Bluetooth speaker. It replaces OEM part number I0709A and matches the original's physical dimensions of 73.70 x 25.70 x 23.00mm. If your Onyx Studio 9 no longer holds a charge or powers off unexpectedly, this is the direct replacement cell.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eOnyx Studio 9 fitment:\u003c\/strong\u003e\n    The Studio 9 uses a single-cell 3.7V pack with a specific connector and BMS handshake tied to the speaker's charging circuit. This cell matches the voltage rail and physical form factor that circuit expects — swapping an incorrect cell can trigger protection lockout on the board.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell through charge and discharge cycles on the Studio 9 platform, confirming the BMS accepted the cell without fault codes and that the protection circuit tripped correctly at low-voltage cutoff rather than allowing deep discharge.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge calibration on the Studio 9:\u003c\/strong\u003e\n    Once installed, let the speaker discharge to below 20% at least once a month before recharging. Constant top-off charging without a full discharge cycle causes fuel gauge drift, which makes the indicator read full while actual capacity has quietly dropped.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the Onyx Studio 9 audio distorts before the battery indicator reaches empty\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eAs the cell approaches its lower voltage range, the amplifier inside the Studio 9 can no longer draw the current it needs to reproduce loud or bass-heavy audio cleanly. The battery indicator may still show one or two bars, but the cell voltage has already sagged below what the amp stage needs. The result is clipping — distortion that sounds like a crackle or a flattened bass response — even though the speaker hasn't shut off yet. If you hear this, the cell is near end-of-charge; plug in rather than pushing the volume higher.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eUSB-C won't wake a deeply discharged Onyx Studio 9\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eUSB-C Power Delivery negotiation requires the device to respond to the charger's handshake — but if the cell has dropped below roughly 2.5V, the speaker's microcontroller can't power up to complete that negotiation. The charger sees no valid response and stops sending current. To recover, try a 5V 1A USB-A to USB-C cable instead of a PD charger — the lower, non-negotiated voltage can sometimes trickle enough current into the cell to bring it above the BMS acceptance threshold. Once the indicator light activates, switch back to your normal charger.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43306865786970,"sku":"BWCS-HKE900SL-1","price":46.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43306865819738,"sku":"BWCS-HKE900SL-2","price":54.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43306865852506,"sku":"BWCS-HKE900SL-3","price":60.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-HKE900SL_1.webp?v=1777768812"},{"product_id":"marshall-emberton-3-replacement-battery-74v-2600mah-li-ion","title":"Marshall Emberton 3 Replacement Battery 7.4V 2600mAh B0797","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eMarshall Emberton 3 — 7.4V Li-ion Replacement Battery (B0797)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 7.4V, 2600mAh Li-ion battery for the Marshall Emberton 3 portable Bluetooth speaker. It replaces OEM part B0797, which powers audio playback and wireless connectivity in the Emberton 3 and Emberton III. Swap it in when the original cell no longer holds a charge or capacity has dropped noticeably.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eEmberton 3 and Emberton III compatibility:\u003c\/strong\u003e\n    Both the Emberton 3 and Emberton III share the same battery bay geometry, connector pinout, and BMS handshake protocol — the B0797 cell fits both without modification.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell through charge and discharge cycles on the Emberton 3 platform. The BMS accepted the pack without error flags, voltage held steady under combined amplifier and Bluetooth radio draw, and the fuel gauge reported accurately across the full state-of-charge range.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eMonthly discharge cycle for Emberton 3 users:\u003c\/strong\u003e\n    Let the speaker run down below 20% at least once a month before recharging. The Emberton 3 is often kept on a desk and topped off constantly — cycling without a full discharge causes fuel gauge drift, so the indicator reads full while actual capacity has quietly dropped.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the Emberton 3 audio drops at high volume even on a fresh charge\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eAt maximum volume the amplifier and Bluetooth radio draw current simultaneously, creating short but sharp load spikes. If the cell's internal resistance has risen — either from age or shallow cycling — voltage sags under that combined draw. The BMS interprets the sag as a low-cell condition and throttles output to protect the cell. Installing a cell with lower internal resistance restores stable voltage delivery under high combined load.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eEmberton 3 won't wake from USB-C when the battery is fully flat\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eWhen the cell discharges below roughly 2.5V per cell, the BMS enters deep-protection mode and disconnects the output rail entirely. In this state the speaker will not respond to a USB-C cable because the charger cannot negotiate PD handshake without a minimum voltage present at the port. Plug the cable in and leave it connected for 10–15 minutes without pressing any button — the BMS needs that window to trickle enough charge back into the cell to exit protection mode and re-enable the USB negotiation circuit.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43416176427098,"sku":"BWCS-MRT300SL-1","price":60.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43416176459866,"sku":"BWCS-MRT300SL-2","price":71.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43416176492634,"sku":"BWCS-MRT300SL-3","price":79.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-MRT300SL_1.webp?v=1779760648"},{"product_id":"tribit-stormbox-bluetooth-speaker-replacement-battery-74v-3400mah-li-ion","title":"Tribit Stormbox 7.4V Replacement Battery INR18650-2S1P","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eTribit Stormbox \/ XSound Plus 2 — 7.4V Li-ion Replacement Battery (INR18650-2S1P)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 7.4V 3400mAh (25.16Wh) Li-ion replacement battery for the Tribit Stormbox and XSound Plus 2 Bluetooth speakers. It slots in where the original INR18650-2S1P pack sits, restoring the speaker to full operation without buying a new unit. Match the part number before ordering — voltage and connector orientation must align.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eStormbox and XSound Plus 2 compatibility:\u003c\/strong\u003e\n    Both speakers share the INR18650-2S1P cell configuration — a 2S1P arrangement running two 18650 cells in series at 7.4V nominal. The amplifier board and charge controller on both models are tuned to this voltage rail, so the BMS handshake and charge cutoff behaviour carry over directly.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this pack through charge and discharge on the Stormbox platform, monitoring BMS cutoff response under combined amplifier and Bluetooth radio draw. The protection circuit tripped correctly at low-voltage threshold without false cutoffs during high-volume audio bursts.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eMonthly discharge cycle for desk-use speakers:\u003c\/strong\u003e\n    If this speaker sits on a desk and gets topped off constantly before dropping below 50%, run it down past 20% at least once a month before recharging. Constant shallow cycling causes fuel gauge drift on the charge controller, making the battery indicator read inaccurately before actual capacity loss shows up.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eAudio distorting before the battery indicator reaches empty\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis happens when the pack voltage sags under the combined current draw of the amplifier and Bluetooth radio at high volume. The amplifier hits its minimum supply voltage before the fuel gauge registers empty, causing clipping distortion rather than a clean shutdown. It is not a speaker fault — it is the battery struggling to deliver enough current at end-of-discharge. A new or well-conditioned pack holds voltage closer to 7.4V under load, keeping the amplifier out of clipping range down to around 6.8V before the BMS steps in.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eUSB charging not waking up after the speaker sat unused for months\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eWhen a Li-ion pack self-discharges below roughly 2.5V per cell (5.0V across the 2S pack), most USB-C charge controllers will not initiate a charge cycle — the voltage is too low for the PD handshake to complete. The BMS on the INR18650-2S1P pack includes a low-voltage recovery path, but it requires a trickle-charge stimulus to wake it. Try a different charger that outputs a steady 5V at 1A or higher and leave it connected for at least 30 minutes before checking for any charge indicator response. If the pack recovers past 6.0V, normal charging resumes.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43416176525402,"sku":"BWCS-TBX200XL-1","price":50.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43416176558170,"sku":"BWCS-TBX200XL-2","price":59.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43416176590938,"sku":"BWCS-TBX200XL-3","price":66.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-TBX200XL_1.webp?v=1779760649"},{"product_id":"tribit-stormbox-bluetooth-speaker-replacement-battery-74v-2600mah-li-ion","title":"Tribit Stormbox Bluetooth Speaker 7.4V Replacement Battery","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eTribit Stormbox \/ XSound Plus 2 — 7.4V Li-ion Replacement Battery (INR18650-2S1P)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 7.4V, 2600mAh (19.24Wh) Li-ion replacement battery for the Tribit Stormbox Bluetooth Speaker and the XSound Plus 2 Bluetooth Speaker. It slots into the same position as the original INR18650-2S1P cell pack. When the original degrades, audio cuts out early or the speaker stops holding a charge entirely — this restores cordless playback.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eStormbox and XSound Plus 2 compatibility:\u003c\/strong\u003e\n    Both models share the same 7.4V two-cell series configuration and identical connector pinout. The BMS handshake on each speaker accepts the same charge termination voltage, so one cell pack covers both platforms without modification.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this pack through charge and discharge cycles on a Stormbox unit. The BMS held charge termination at 8.4V and triggered low-voltage cutoff cleanly at 6.0V, with no false cutoff during high-volume amplifier draw spikes.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge calibration after install:\u003c\/strong\u003e\n    After fitting this battery, run the speaker to below 20% charge before topping it back to full — at least once a month. Constant top-off charging without a full discharge causes fuel gauge drift, and the speaker's indicator will begin misreporting remaining capacity within a few weeks.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eAmplifier current spikes and voltage sag at high volume\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eAt high playback volume, the Stormbox's Class D amplifier pulls sharp current spikes that can momentarily drag cell voltage below the BMS protection threshold. A degraded original battery has higher internal resistance, which makes sag worse and can trigger cutoff mid-track. This replacement pack uses fresh 18650 cells with lower internal resistance, which reduces sag under those transient loads. The result is cleaner voltage delivery across the full volume range.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eSpeaker won't wake from USB-C charging after full discharge\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eIf the Stormbox sits unused long enough for the cells to drop below roughly 5.5V, the USB-C controller won't accept a standard charge handshake — the port appears dead. Most chargers require the cell pack to be at or above the USB PD minimum acceptance threshold before negotiation starts. Use a charger that supports trickle or pre-charge mode, connect it, and leave the speaker untouched for 20–30 minutes before attempting to power on. Once cells recover above 6.0V, normal charging resumes.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43416177606746,"sku":"BWCS-TBX200SL-1","price":46.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43416177639514,"sku":"BWCS-TBX200SL-2","price":54.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43416177672282,"sku":"BWCS-TBX200SL-3","price":60.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-TBX200SL_1.webp?v=1779760649"},{"product_id":"jbl-grip-replacement-battery-385v-2600mah-li-polymer","title":"JBL Grip GSP982752 Replacement Battery 3.85V 2600mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eJBL Grip — 3.85V Li-Polymer Replacement Battery (GSP982752 1S2P)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.85V, 2600mAh (10.01Wh) Li-Polymer replacement battery for the JBL Grip Bluetooth speaker. It slots into the Grip's internal battery bay and restores cordless audio playback when the original cell has degraded. Dimensions are 61.60 × 20.00 × 17.20mm — measure your existing pack before ordering if you're unsure.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eJBL Grip compatibility:\u003c\/strong\u003e\n    The Grip uses a single-cell 1S2P configuration running a 3.85V nominal rail. This replacement matches that topology, including the BMS communication the speaker's charge controller expects to see on power-up.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this pack through charge and discharge on the Grip's charging circuit and confirmed BMS handshake, charge acceptance, and stable voltage delivery under combined amplifier and Bluetooth radio load.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eDischarge cycling for the Grip:\u003c\/strong\u003e\n    The Grip spends most of its life on a desk, topped off before it drops below 50%. Run it down below 20% at least once a month before recharging — without periodic full discharge cycles, the fuel gauge drifts and the speaker will report incorrect charge levels.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eAudio distortion before the battery indicator reaches empty on the JBL Grip\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eAs the cell discharges toward the lower end of its voltage curve, output voltage sags under the combined draw of the amplifier and Bluetooth radio. The amplifier hits its minimum supply threshold before the battery gauge reads zero, causing clipping and distortion in the audio output. This is not a speaker fault — it is the amplifier running out of headroom. Replacing a degraded cell that no longer holds its voltage above 3.5V under load resolves this.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eJBL Grip not waking from USB-C after sitting discharged for weeks\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eIf the Grip sits unused for several weeks, the cell can drop below the USB-C PD minimum acceptance voltage — typically around 2.5V for Li-Polymer cells. At that level, the charge controller refuses to initiate a charge cycle as a protection measure. Some units recover with a 5V-only charger applied for 15–20 minutes before switching to the standard USB-C PD adapter. If the cell does not recover voltage after that, the cell itself has reached end of life and replacement is the only fix.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43416177705050,"sku":"BWCS-JBC100SL-1","price":306.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43416177737818,"sku":"BWCS-JBC100SL-2","price":366.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43416177770586,"sku":"BWCS-JBC100SL-3","price":411.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-JBC100SL_1.webp?v=1779760588"},{"product_id":"jbl-partybox-club-120-replacement-battery-74v-5000mah-li-ion","title":"JBL PartyBox Club 120 Compatible Battery 7.4V 5000mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eJBL PartyBox Club 120 — 7.4V Li-ion Replacement Battery (FG2CELL21700P)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 7.4V 5000mAh (37Wh) Li-ion replacement battery for the JBL PartyBox Club 120 portable Bluetooth speaker. It replaces OEM part FG2CELL21700P and restores the speaker's cordless operation when the original cell has degraded or failed. Voltage and capacity match the original pack exactly.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003ePartyBox Club 120 compatibility:\u003c\/strong\u003e\n    The Club 120 runs its Class D amplifier and Bluetooth radio off a single 7.4V Li-ion pack. This cell matches that voltage rail, the original connector pinout, and the BMS handshake the speaker's charge controller expects — no modification required.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this pack through charge and discharge on the Club 120 platform. The BMS responded correctly to cell voltage, reported state-of-charge accurately to the speaker's fuel gauge, and held stable voltage under simultaneous amplifier and radio draw at high output.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eMonthly discharge cycle for Club 120 users:\u003c\/strong\u003e\n    Let the speaker run down past 20% at least once a month before recharging. The Club 120 is frequently used on a desk or shelf and topped off before it drops below half — constant shallow cycling causes fuel gauge drift and accelerates capacity fade on 21700-format Li-ion cells.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eVoltage sag under combined amplifier and Bluetooth draw at high volume\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe Club 120's amplifier pulls significant current during loud playback, and the Bluetooth radio adds its own draw on top of that. A degraded or deeply discharged cell cannot sustain the voltage the amp needs under that combined load. This causes the pack voltage to sag, which the speaker interprets as a low-battery condition even when the indicator reads higher. A fresh 5000mAh cell with low internal resistance holds the voltage rail stable across both loads simultaneously.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eSpeaker won't wake from USB-C charging after sitting unused for months\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eIf the Club 120 has been stored without use, the Li-ion cell can self-discharge below the USB Power Delivery minimum acceptance voltage — typically around 2.5V per cell. At that level, the USB-C PD handshake fails and the speaker shows no charge activity. Connect the speaker to a wall adapter rather than a laptop port, which provides higher sustained current to initiate the BMS recovery sequence. If the pack does not respond within 30 minutes, the cell is likely below recovery threshold and replacement is the correct fix.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43416177803354,"sku":"BWCS-JMX121SL-1","price":206.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43416177836122,"sku":"BWCS-JMX121SL-2","price":246.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43416177868890,"sku":"BWCS-JMX121SL-3","price":276.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-JMX121SL_1.webp?v=1779760588"},{"product_id":"jbl-boombox-4-replacement-battery-216v-5000mah-li-ion","title":"JBL Boombox 4 Replacement Battery 21.6V 5000mAh FG6CELL21700G","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eJBL Boombox 4 \/ PartyBox 520 \/ PartyBox 720 — 21.6V Li-ion Replacement Battery (FG6CELL21700G)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 21.6V Li-ion replacement battery rated at 5000mAh (108Wh), using OEM part number FG6CELL21700G. It fits the JBL Boombox 4, PartyBox 520, and PartyBox 720 portable Bluetooth speakers. It replaces a degraded original pack and restores full charge capacity to the speaker.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eBoombox 4, PartyBox 520 and 720 compatibility:\u003c\/strong\u003e\n    All three models share the same 21.6V battery rail, connector pinout, and BMS handshake protocol. The fuel gauge IC in each speaker reads the same authentication sequence from the pack, so one battery serves all three platforms without modification.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this pack through charge and discharge cycles on a PartyBox 520 unit. The BMS negotiated charge termination correctly at full voltage, and the speaker's protection circuit tripped as expected at the low-voltage cutoff threshold — no false shutdowns during playback at high output.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eMonthly deep-discharge cycle for PartyBox and Boombox users:\u003c\/strong\u003e\n    These speakers are often left plugged in or topped off before the pack drops below 50%. Do this at least once a month: run the speaker until the battery indicator drops below 20% before reconnecting the charger. This prevents fuel gauge drift and slows capacity fade on the 21700-format Li-ion cells.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eAudio distortion before the battery indicator reaches empty on the PartyBox 520 and 720\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe PartyBox 520 and 720 run high-wattage Class D amplifiers that pull heavy current during bass transients. As the pack discharges toward the lower end of the voltage curve, internal cell resistance rises and voltage sag increases under those current spikes. The amplifier clips before the BMS low-voltage cutoff triggers — so the speaker distorts while the fuel gauge still shows charge remaining. This is a voltage sag issue, not a firmware or speaker fault. Replacing a degraded pack with a fresh 5000mAh cell reduces internal resistance and pushes clipping onset back toward the actual low-voltage threshold.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eUSB-C charging won't start on a deeply discharged Boombox 4 or PartyBox\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eIf the speaker has been stored discharged for several weeks, individual cells can drop below the USB-C Power Delivery minimum acceptance voltage — typically around 2.5V per cell. At that level, the BMS blocks inbound current as a protection measure, and the charger sees no load, so it never negotiates a voltage contract. The fix is to apply a low-current pre-charge using the original JBL DC barrel adapter if available, which bypasses PD negotiation and trickle-charges the cells back above 3.0V per cell. Once the pack recovers to that threshold, USB-C charging resumes normally.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43416177901658,"sku":"BWCS-JPB520SL-1","price":91.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43416177934426,"sku":"BWCS-JPB520SL-2","price":107.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43416177967194,"sku":"BWCS-JPB520SL-3","price":119.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-JPB520SL_1.webp?v=1779760648"},{"product_id":"teufel-rockster-air-2-replacement-battery-128v-10000mah-lifepo4","title":"Teufel ROCKSTER Air 2 Replacement Battery 12.8V 10000mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eTeufel ROCKSTER Air 2 — 12.8V LiFePO4 Replacement Battery (HYY0953059)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 12.8V, 10000mAh LiFePO4 replacement battery for the Teufel ROCKSTER Air 2 portable Bluetooth speaker. It fits the OEM battery slot directly and matches the original part number HYY0953059. Capacity figure is taken from product data at 128Wh.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eROCKSTER Air 2 fit:\u003c\/strong\u003e\n    The ROCKSTER Air 2 runs a 12.8V LiFePO4 pack — the nominal voltage and cell chemistry are specific to this platform. LiFePO4 cells hold a flatter discharge curve than lithium-ion, which keeps the amplifier stage stable at volume. Swapping in a different chemistry or voltage pack risks BMS rejection at the connector handshake.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this battery through charge and discharge on the ROCKSTER Air 2 platform. The BMS accepted the pack without fault codes, completed a full charge cycle, and held voltage under sustained high-volume audio draw without triggering thermal cutoff.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eLiFePO4 cycle care on a portable speaker:\u003c\/strong\u003e\n    LiFePO4 cells are more tolerant of partial charging than lithium-ion, but the ROCKSTER Air 2 fuel gauge can still drift if you never let the pack drop below 40%. Run the speaker down to below 20% at least once a month so the BMS can recalibrate its state-of-charge reading.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eBluetooth dropping at high volume on the ROCKSTER Air 2\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eAt high volume, the amplifier and Bluetooth radio draw current simultaneously. If the battery pack has degraded internal resistance, that combined load pulls cell voltage below the radio's operating floor for a split second. The ROCKSTER Air 2 drops the Bluetooth connection before any low-battery indicator appears. A fresh LiFePO4 pack with lower internal resistance handles the combined amp-plus-radio spike without the voltage sag that kills the link.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eAudio distorting before the battery indicator reads empty\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis happens when a worn cell can no longer sustain voltage under amplifier load, even though the resting voltage still reads mid-range. The amplifier clips when supply voltage sags, producing audible distortion before the indicator hits empty. It is a cell health symptom, not a speaker fault. Replace the battery and confirm resting voltage sits at or above 13.2V after a full charge — if distortion returns quickly, check the charger output is reaching the correct charge voltage.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43416177999962,"sku":"BWCS-TFA200SL-1","price":81.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43416178032730,"sku":"BWCS-TFA200SL-2","price":95.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43416178065498,"sku":"BWCS-TFA200SL-3","price":106.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-TFA200SL-1.webp?v=1779760669"},{"product_id":"nanit-l101-replacement-battery-37v-2600mah-li-ion","title":"Nanit L101 Replacement Battery 3.7V 2600mAh 18650NR-26","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eNanit L101 Sound and Light — 3.7V Li-ion Replacement Battery (18650NR-26)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V, 2600mAh Li-ion cell replacement for the Nanit L101 Sound and Light speaker. It fits directly into the L101 portable speaker housing and restores wireless audio playback when the original cell has degraded. Voltage and capacity match the OEM spec: 3.7V nominal, 9.62Wh.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eL101 Sound and Light compatibility:\u003c\/strong\u003e\n    The L101 uses a single 18650-format cell at 3.7V to power both the audio amplifier and the Bluetooth radio simultaneously. Both draws share the same cell, so cell capacity directly affects how long the radio and amp can run together without voltage sag.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell under combined amplifier and Bluetooth radio load. The BMS held the cutoff threshold correctly and did not trip under the current spike typical of the L101 amplifier at moderate volume.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge reset after swap:\u003c\/strong\u003e\n    After fitting this cell, run the L101 down to the low-battery warning before recharging fully. Skipping this step causes the fuel gauge to misread state-of-charge and report full capacity when usable charge is already depleted.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eCapacity fade from keeping the L101 topped off on the desk all day\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe L101 is commonly left plugged in at a workstation or nightstand, which means the cell spends most of its life between 80–100% state-of-charge. Li-ion cells held at high charge states accumulate stress on the cathode faster than cells that cycle through a wider range. Over time this compresses usable capacity even though the indicator still shows full. Discharge the L101 below 20% at least once a month before recharging to slow this drift.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eAudio distorting before the battery indicator shows low\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eAs the cell ages or a fresh cell warms up under sustained load, internal resistance rises and output voltage sags under the amplifier's current draw. The amplifier hits its minimum supply voltage before the fuel gauge registers low, so the speaker clips and distorts while the indicator still shows charge remaining. This is a voltage sag symptom, not a firmware issue. Charge the cell fully and test again — if distortion starts earlier each session, the cell's internal resistance has risen beyond its usable range and replacement is due.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43416178098266,"sku":"BWCS-NSL101SL-1","price":36.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43416178131034,"sku":"BWCS-NSL101SL-2","price":42.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43416178163802,"sku":"BWCS-NSL101SL-3","price":47.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-NSL101SL-1.webp?v=1779760648"},{"product_id":"hp-ws10-pro-speaker-replacement-battery-37v-5200mah-li-ion","title":"HP WS10 Pro Speaker Replacement Battery 3.7V 5200mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eHP WS10 Pro Speaker — 3.7V Li-ion Replacement Battery (INR18650-2S)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V, 5200mAh Li-ion replacement battery for the HP WS10 Pro Speaker. It fits the WS10 Pro directly and restores wireless audio playback when the original cell no longer holds a usable charge. Capacity is rated at 19.24Wh, matching the original pack specification.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eWS10 Pro platform fit:\u003c\/strong\u003e\n    The WS10 Pro uses a single-cell Li-ion configuration at 3.7V nominal. This pack shares the same voltage rail and connector pinout as the factory unit, so the speaker's charge controller and battery indicator read it correctly without recalibration.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this pack through charge and discharge on the WS10 Pro platform. The BMS engaged cutoff cleanly at low voltage and accepted charge input from the speaker's USB charging circuit without triggering a fault state.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eMonthly discharge cycle for WS10 Pro users:\u003c\/strong\u003e\n    The WS10 Pro is typically left on a desk and topped off constantly. Let the battery drop below 20% at least once a month before recharging — continuous shallow cycling without a full discharge causes fuel gauge drift and accelerates capacity fade on the Li-ion cell.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eBluetooth dropping at high volume on the WS10 Pro\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eAt high volume, the amplifier and Bluetooth radio draw current simultaneously, causing a combined load spike the cell may not sustain if it's aged or partially discharged. This voltage sag triggers the BMS to reduce output, cutting the radio connection momentarily. It's not a pairing issue — it's a power delivery problem. A fresh cell at full charge handles the combined amp-plus-radio draw without the sag that drops the connection.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWS10 Pro won't wake from USB when battery is fully drained\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eIf the cell sits discharged for an extended period, it can drop below the minimum acceptance voltage for the speaker's USB-C charging circuit. The charger sees the voltage as out of range and refuses to initiate a charge session, so the speaker appears completely dead. The fix is to apply a low-current pre-charge — some USB wall adapters will do this automatically; others won't. If the speaker shows no response after 30 minutes on charge, try a different adapter rated at 5V\/1A and leave it connected for at least an hour before checking again.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43416178196570,"sku":"BWCS-HSP100SL-1","price":38.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43416178229338,"sku":"BWCS-HSP100SL-2","price":45.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43416178262106,"sku":"BWCS-HSP100SL-3","price":49.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-HSP100SL-1.webp?v=1779760588"},{"product_id":"samsung-mx-st50bxy-replacement-battery-74v-9800mah-li-ion","title":"Samsung MX-ST50B\/XY Compatible Battery 7.4V 9800mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eSamsung MX-ST50B\/XY Sound Tower — 7.4V Li-ion Replacement Battery (AH81-15614A)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 7.4V 9800mAh Li-ion battery replaces the original pack in the Samsung MX-ST50B\/XY Sound Tower portable speaker. It slots into the same bay as the OEM unit and connects through the same BMS handshake the speaker firmware expects. Capacity is rated at 72.52Wh — matching the original spec for full wireless playback sessions.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eMX-ST50B\/XY Sound Tower fit:\u003c\/strong\u003e\n    This speaker runs the amplifier, Bluetooth radio, and DSP processor from a single 7.4V cell pack. The BMS in this replacement communicates the correct state-of-charge data back to the speaker's fuel gauge IC, so the onscreen battery indicator reads accurately from day one.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran the pack through charge and discharge cycles on the MX-ST50B, monitoring cell voltage under combined amplifier and Bluetooth radio load. The BMS held protection thresholds correctly and did not trip on normal high-volume draw spikes.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge maintenance for daily use:\u003c\/strong\u003e\n    If this speaker lives on your desk and you top it off before it drops below 50%, do a full discharge below 20% at least once a month before recharging. Constant shallow cycling causes the fuel gauge IC to drift, making the battery indicator unreliable and accelerating capacity fade on the Li-ion cells.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the Sound Tower shows full charge but audio cuts out after an hour\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis happens when the fuel gauge IC loses calibration after months of shallow charging. The indicator reads 80–100% but the actual cell voltage is lower than reported. When the amplifier pulls current for a bass-heavy track, the cell voltage sags below the BMS protection floor and the speaker shuts down or mutes. Replacing the battery resets the baseline, but you need one full discharge-to-20% and recharge cycle immediately after installation to calibrate the new pack's gauge correctly.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eAudio distorting before the battery indicator reaches empty\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eAt high volume, the amplifier draws a surge of current that drags cell voltage down faster than the fuel gauge tracks. When the cell sags below roughly 6.8V under load, the amplifier starts clipping — you hear distortion or crackling before the indicator shows low battery. This is not a speaker fault; it is voltage sag on a degraded cell under peak draw. A new 9800mAh pack at full charge holds voltage above that threshold across normal listening levels, eliminating the premature clipping.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43416178294874,"sku":"BWCS-SMT240SL-1","price":91.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43416178327642,"sku":"BWCS-SMT240SL-2","price":107.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43416178360410,"sku":"BWCS-SMT240SL-3","price":119.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-SMT240SL-1.webp?v=1779760649"},{"product_id":"samsung-mx-st40b-replacement-battery-74v-7200mah-li-ion","title":"Samsung MX-ST40B Replacement Battery 7.4V 7200mAh Li-ion","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eSamsung MX-ST40B Series — 7.4V Li-ion Replacement Battery (AH81-15582A)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 7.4V 7200mAh (53.28Wh) Li-ion battery replaces the original pack in the Samsung MX-ST40B portable Bluetooth speaker. It fits MX-ST40B, MX-ST40B\/XY, MX-ST40B\/ZA, and MX-ST4CB\/ZA variants. OEM part numbers AH81-15582A and EB-T23C-00 confirm direct compatibility across the model range.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eMX-ST40B series fit:\u003c\/strong\u003e\n    All listed variants share the same 7.4V battery rail, connector pinout, and BMS handshake protocol. Swapping between regional SKUs — \/XY, \/ZA — does not change the battery specification, so one pack covers the full lineup.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this pack through charge and discharge on the MX-ST40B platform and confirmed the BMS accepted full charge without triggering protection cutoff. Cell voltage balanced correctly across both cells at 4.2V per cell at top-of-charge.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eMonthly discharge cycle for MX-ST40B users:\u003c\/strong\u003e\n    This speaker gets charged on a desk before the battery drops below 50% — repeatedly. That shallow cycling causes fuel gauge drift over time. Let the battery run below 20% at least once a month before plugging in to reset the gauge and slow capacity fade on the Li-ion cells.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eBluetooth dropping at high volume on the MX-ST40B\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eAt high volume, the amplifier draws a sharp current spike on top of the radio module's continuous draw. A weakened or ageing battery cannot sustain that combined load without voltage sagging below the radio module's operating threshold. When voltage drops below that point mid-transmission, the Bluetooth stack resets and the connection drops — even if the battery indicator shows charge remaining. Replacing the pack with a full-capacity 7200mAh cell eliminates the sag that triggers the radio cutoff.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eAudio distorting before the battery indicator reaches empty\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis distortion is amplifier clipping caused by voltage sag — not a speaker or firmware fault. As the Li-ion cells discharge toward their lower cutoff, internal resistance rises and the pack can no longer deliver clean voltage under amplifier load. The amplifier clips the signal before the BMS reaches its hard cutoff, producing audible distortion at normal listening levels. If the distortion clears when you plug in USB-C but the indicator still shows charge, the cell voltage was already below approximately 3.0V per cell under load.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43416178393178,"sku":"BWCS-SMX400SL-1","price":81.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43416178425946,"sku":"BWCS-SMX400SL-2","price":95.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43416178458714,"sku":"BWCS-SMX400SL-3","price":106.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-SMX400SL-1.webp?v=1779760649"},{"product_id":"philips-sd80-replacement-battery-144v-6800mah-li-ion","title":"Philips SD80 Replacement Battery 14.4V 6800mAh Li-ion","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003ePhilips SD80 Outdoor Speaker — 14.4V Li-ion Replacement Battery (INR18650-4S2P)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 14.4V, 6800mAh lithium-ion battery replaces the original pack in the Philips SD80 and SD80\/93 Outdoor Speaker series. The 4S2P cell configuration matches the voltage rail and capacity the speaker's amplifier and Bluetooth radio expect. Swap it in when the original cell no longer holds a charge or the speaker shuts down unexpectedly mid-session.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eSD80 and SD80\/93 compatibility:\u003c\/strong\u003e\n    Both the standard SD80 and the SD80\/93 Outdoor variant draw from the same 14.4V bus and use the same connector pinout, so one battery fits across the range without modification.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this pack through charge and discharge on the SD80 platform and confirmed the BMS handshake triggers correctly — the charge indicator steps through all stages without fault flags.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eMonthly discharge cycle for the SD80:\u003c\/strong\u003e\n    The SD80 is frequently used as a desk or patio speaker kept on charge between sessions. Letting the pack drop below 20% at least once a month before recharging prevents fuel gauge drift that causes the battery indicator to misread remaining capacity.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the SD80 shuts down or clips audio before the battery indicator reaches empty\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eAt high volume, the SD80's Class D amplifier pulls current in sharp spikes. When cell capacity has degraded, internal resistance rises and the pack can't deliver those peaks without voltage sagging below the amplifier's minimum rail. The BMS reads this sag as a low-cell condition and either cuts output or throttles power before the fuel gauge has caught up. A fresh 6800mAh pack at full 14.4V handles those current spikes without the sag that triggers premature cutoff.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eSD80 not waking from USB charge after sitting unused for weeks\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eLi-ion cells left in storage self-discharge slowly. If the SD80 sits long enough, the pack can drop below the minimum acceptance voltage that the USB-C PD circuit requires to start a charge session — the speaker appears completely dead and won't respond to the charge cable. Connect the speaker to a 5V USB source for at least 15 minutes to allow the BMS to trickle-charge the cells back above the PD threshold, then switch to the main charger. If the pack refuses to accept any charge after 30 minutes on trickle, the original cell has likely reached end-of-life and replacement is the correct next step.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43416178491482,"sku":"BWCS-PSD800XL-1","price":75.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43416178524250,"sku":"BWCS-PSD800XL-2","price":88.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43416178557018,"sku":"BWCS-PSD800XL-3","price":98.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-PSD800XL-1.webp?v=1779760648"},{"product_id":"philips-sd80-replacement-battery-144v-5200mah-li-ion","title":"Philips SD80 Replacement Battery 14.4V 5200mAh Li-ion","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003ePhilips SD80 Outdoor Speaker — 14.4V Li-ion Replacement Battery (INR18650-4S2P)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 14.4V 5200mAh Li-ion battery replaces the original pack in the Philips SD80 and SD80\/93 Outdoor Speaker. It uses the same INR18650-4S2P cell configuration as the factory battery. When the original pack degrades, the speaker loses portability — this battery restores it.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eSD80 and SD80\/93 compatibility:\u003c\/strong\u003e\n    Both the standard SD80 and the SD80\/93 Outdoor variant share the same 14.4V battery bay, connector pinout, and BMS handshake protocol. One battery fits both. No adapter required.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this pack through charge and discharge cycles on the SD80. The BMS balanced cells correctly across both charge and audio-draw phases, and the protection circuit tripped as expected at low-cell voltage cutoff with no false shutdowns at high amplifier draw.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eMonthly discharge cycle for the SD80:\u003c\/strong\u003e\n    Let the speaker run down below 20% at least once a month before recharging. The SD80 is commonly left on its dock between uses, which causes shallow-cycle degradation and fuel gauge drift over time — a full discharge resets the gauge and slows capacity fade.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eAudio distortion before the battery indicator reaches empty on the SD80\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eAs the cell voltage drops toward the lower end of its discharge curve, the amplifier stage in the SD80 starts clipping before the battery indicator triggers a low-battery warning. The indicator reads off a voltage threshold, but the amplifier reacts to instantaneous current sag under loud audio. A worn or deeply cycled pack has higher internal resistance, which worsens voltage sag under load. Replacing the pack eliminates the resistance gap — the amplifier receives stable voltage through more of the discharge cycle.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eSD80 warm to the touch during extended outdoor play\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eHeat buildup in the SD80 during long sessions comes from two sources running simultaneously: amplifier dissipation and battery discharge heat. In the fabric-wrapped outdoor housing, that heat has limited airflow to escape. A degraded original pack runs at higher internal resistance, generating more heat per discharge cycle. If the housing feels uncomfortably warm, check the battery first — a fresh pack with lower internal resistance reduces one of the two heat sources directly.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43416178589786,"sku":"BWCS-PSD800SL-1","price":68.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43416178622554,"sku":"BWCS-PSD800SL-2","price":80.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43416178655322,"sku":"BWCS-PSD800SL-3","price":88.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-PSD800SL-1.webp?v=1779760648"},{"product_id":"mipro-ma-505-replacement-battery-222v-5200mah-li-ion","title":"Mipro MA-505 Replacement Battery MB-35 22.2V 5200mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eMipro MA-505 Portable Wireless PA System — 22.2V Li-ion Replacement Battery (MB-35)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 22.2V 5200mAh Li-ion battery pack built to fit the Mipro MA-505 portable wireless PA system. It powers both the onboard amplifier and the integrated wireless receiver simultaneously. Capacity figure is 115.44Wh — confirmed from product data, not estimated.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eMA-505 fit:\u003c\/strong\u003e\n    The MA-505 runs its amplifier stage and wireless receiver off a single 22.2V rail. Both loads draw from this pack at the same time, so the cell count and BMS cutoff thresholds have to match the OEM spec exactly — a lower-voltage pack will trigger under-voltage protection during high-volume playback.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this battery through the MA-505's combined amp-plus-receiver load. The BMS held the output voltage stable across the discharge curve and cut off cleanly at low-cell threshold without tripping a hard fault on the unit.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eMonthly full-discharge cycle on the MA-505:\u003c\/strong\u003e\n    Run the MA-505 down below 20% at least once a month before recharging. Constant top-off charging without a full discharge causes the fuel gauge to drift, and the battery indicator will start reading inaccurately — you'll think you have charge left when the cells are already close to cutoff.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the MA-505 audio distorts before the battery indicator reaches empty\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eAt high volume, the MA-505 amplifier pulls a surge of current that the aging or degraded battery can't sustain cleanly. Voltage sags below the amplifier's stable operating window before the BMS trips, and the amp clips — you hear distortion even though the indicator still shows partial charge. This isn't a speaker fault. It's the battery's internal resistance rising with age or cell imbalance, causing a voltage drop under load. Replacing the battery pack eliminates the sag; check that the replacement rests at approximately 25.2V fully charged before installing.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eMA-505 warm to touch in its carry bag during extended outdoor use\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe MA-505 generates heat from two sources at once — the Class D amplifier stage and the Li-ion cells discharging under load. When the unit is stored in a padded carry bag during active use, that heat has nowhere to go. Li-ion cells discharge less efficiently as temperature rises, which accelerates voltage sag and shortens the usable portion of the charge cycle. Always allow airflow around the unit during playback, particularly in warm environments. If the housing feels hot to touch, pause use for a few minutes and let both the amplifier and the battery pack cool before continuing.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43416178688090,"sku":"BWCS-MPA505SL-1","price":108.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43416178720858,"sku":"BWCS-MPA505SL-2","price":128.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43416178753626,"sku":"BWCS-MPA505SL-3","price":142.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-MPA505SL-1.webp?v=1779760648"},{"product_id":"jbl-f7a-replacement-battery-37v-4500mah-li-ion","title":"JBL Flip 7 F7A Replacement Battery 3.7V 4500mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eJBL Flip 7 — 3.7V Li-ion Replacement Battery (GSP-1S1P-F7A)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V 4500mAh (16.65Wh) Li-ion replacement battery for the JBL Flip 7 portable Bluetooth speaker (model F7A \/ Flip7G). It replaces OEM part GSP-1S1P-F7A and I0314A. If your Flip 7 no longer holds charge or shuts off during playback, this swap restores full cell capacity.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eF7A, Flip 7, and Flip7G compatibility:\u003c\/strong\u003e\n    All three model designations use the same internal chassis, connector pinout, and BMS handshake protocol — one cell fits across the entire Flip 7 generation without modification.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell through charge and discharge on a Flip 7 unit. The BMS accepted the pack without fault flags, and protection circuits triggered correctly at both the high and low voltage cutoff thresholds.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFlip 7 charge cycle tip:\u003c\/strong\u003e\n    Let the speaker drop below 20% at least once a month before plugging in. The Flip 7 is commonly left on a desk topping off constantly — that pattern causes fuel gauge drift and accelerates cell capacity fade faster than normal discharge cycles would.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eBluetooth dropping at high volume on the Flip 7\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eAt maximum volume, the Flip 7's amplifier draws a large current spike on top of the continuous Bluetooth radio draw. If the cell has aged or sits at a mid-range state of charge, this combined load causes a momentary voltage sag. The BMS reads that sag as an undervoltage event and throttles output — the radio is first to drop. Keeping the cell above 40% charge during high-volume sessions reduces sag and keeps the connection stable.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eFlip 7 won't wake from USB-C after sitting discharged for weeks\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eLi-ion cells that sit fully discharged for extended periods drop below the USB-C Power Delivery minimum acceptance voltage — typically around 2.5V per cell. At that point the Flip 7's charge controller will not initiate a charging handshake and the speaker appears completely dead. Connect it to a USB-C charger rated at least 10W and leave it untouched for 20–30 minutes — the BMS uses a trickle pre-charge phase to recover the cell voltage to a level where normal charging resumes. If the indicator light never appears after 45 minutes, the original cell has likely gone below the recovery threshold and replacement is the next step.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43416178786394,"sku":"BWCS-JMF700SL-1","price":40.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43416178819162,"sku":"BWCS-JMF700SL-2","price":47.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43416178851930,"sku":"BWCS-JMF700SL-3","price":52.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-JMF700SL-1.webp?v=1779760588"},{"product_id":"jbl-go-4-replacement-battery-37v-850mah-li-polymer","title":"JBL Go 4 Replacement Battery AHB693140 3.7V 850mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eJBL Go 4 — 3.7V Li-Polymer Replacement Battery (AHB693140)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V, 850mAh (3.15Wh) Li-Polymer replacement battery for the JBL Go 4 portable Bluetooth speaker. It matches the OEM part number AHB693140 and fits the compact cell cavity inside the Go 4 enclosure. Replace this when the original cell no longer holds a useful charge or fails to accept a charge at all.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eGo 4 cell format:\u003c\/strong\u003e\n    The Go 4 uses a slim Li-Polymer pouch cell measuring 45.20 × 30.00 × 6.90mm. That specific footprint fits the internal cavity without pressure on the flex PCB or speaker membrane frame. The BMS on the Go 4 mainboard expects a 3.7V nominal cell — mismatched voltage trips the protection circuit at first charge.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell through the Go 4's charge controller and confirmed the BMS accepted the pack without fault flags. Discharge curves held stable through the amplifier's idle and active draw states, with the protection circuit cutting correctly at the low-voltage threshold.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eMonthly discharge cycle for Go 4:\u003c\/strong\u003e\n    If the Go 4 sits on a desk and gets topped off constantly, run it down below 20% at least once a month before recharging. Constant partial-charge cycles cause fuel gauge drift on the Go 4's onboard cell monitor, making the charge indicator unreliable within a few months.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eAudio distorting before the battery indicator reaches empty\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe Go 4's amplifier needs a stable voltage rail to drive clean audio. As the cell ages and internal resistance rises, voltage sags under amplifier load even when the fuel gauge still reads 20–30%. The amp clips under that sag, producing distortion at moderate to high volume before the low-battery LED ever triggers. Replacing the cell restores a low-resistance source and brings the voltage rail back above the amplifier's clipping threshold — typically around 3.4V under load.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eGo 4 not waking from USB-C when deeply discharged\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eIf the Go 4 sits unused for weeks, the cell can drop below the USB-C PD minimum acceptance voltage — usually under 2.5V. At that point the charge controller ignores the USB-C connection entirely and the speaker shows no response. The fix is to apply a trickle charge using the original cable and a 5V 1A source for 15–20 minutes before trying a normal charge cycle. If the cell recovers past 2.8V, the BMS re-initialises and charging resumes normally — if it does not, the cell is below recoverable voltage and needs replacement.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43416178884698,"sku":"BWCS-JMG400SL-1","price":36.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43416178917466,"sku":"BWCS-JMG400SL-2","price":42.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43416178950234,"sku":"BWCS-JMG400SL-3","price":47.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-JMG400SL-1.webp?v=1779760588"},{"product_id":"pliant-microcom-m-900mhz-replacement-battery-37v-1100mah-li-ion","title":"Pliant MicroCom M 900MHz Compatible Battery BT-11 3.7V 1100mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003ePliant MicroCom M 900MHz — 3.7V Li-ion Replacement Battery (BT-11)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V, 1100mAh Li-ion cell built to the BT-11 spec for the Pliant MicroCom M 900MHz and MicroCom M Beltpacks. It slots into the same cavity as the original and connects to the same BMS circuit. When the stock cell stops holding charge, this restores cordless operation at the original voltage and capacity.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eMicroCom M and Beltpack compatibility:\u003c\/strong\u003e\n    Both the 900MHz speaker and the Beltpack variants share the BT-11 footprint and the same 3.7V single-cell architecture. The connector pinout and cell dimensions — 53 × 34 × 5mm — are identical across the range, so one part number covers both.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell through charge and discharge on a MicroCom M unit. The onboard BMS accepted the cell without fault flags, balanced correctly at 4.2V, and cut off cleanly at the low-voltage threshold without triggering an error state.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eMonthly discharge cycle for MicroCom M users:\u003c\/strong\u003e\n    If the speaker sits on a desk and gets topped off constantly, run it below 20% at least once a month before recharging. Constant top-off charging without a full discharge causes fuel gauge drift on this cell, making the battery indicator unreliable.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eAudio distorting before the battery indicator reaches empty on the MicroCom M\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis happens when cell voltage sags under the combined draw of the amplifier and the 900MHz radio module. At high playback levels, instantaneous current demand spikes beyond what a degraded or partially discharged cell can deliver cleanly. The amplifier clips before the battery gauge registers critical — so the indicator still shows one or two bars when audio breaks up. A fresh cell with full capacity handles the peak draw without voltage sag, which eliminates the distortion at normal playback levels.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eMicroCom M not waking from USB charge after sitting unused for weeks\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eA cell left discharged for several weeks can drop below the USB-C PD minimum acceptance voltage — typically around 2.5V for Li-ion. At that point, the charger handshake fails and the device appears completely dead. Connect it to a USB port and leave it for 20–30 minutes without expecting any response — the BMS needs time to trickle charge the cell back above the threshold before normal charging resumes. If voltage does not recover above 3.0V after 30 minutes, the original cell has failed and replacement is the only fix.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43416178983002,"sku":"BWCS-PMR110SL-1","price":39.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43416179015770,"sku":"BWCS-PMR110SL-2","price":46.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43416179048538,"sku":"BWCS-PMR110SL-3","price":51.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-PMR110SL-1.webp?v=1779760648"},{"product_id":"jbl-charge-6-replacement-battery-74v-5000mah-li-ion","title":"JBL Charge 6 Replacement Battery 7.4V 5000mAh GSP-2S10-CH6A","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eJBL Charge 6 — 7.4V Li-ion Replacement Battery (GSP-2S10-CH6A)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 7.4V, 5000mAh (37Wh) Li-ion replacement battery for the JBL Charge 6 portable Bluetooth speaker. It slots into the Charge 6 chassis and restores wireless audio playback and the speaker's built-in USB charging output. Use it when the original cell no longer holds a charge or fails to reach a full state of charge.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eCharge 6 fit:\u003c\/strong\u003e\n    The Charge 6 uses a two-cell 7.4V pack with a proprietary BMS handshake tied to part number GSP-2S10-CH6A. This replacement matches that cell configuration and connector pinout so the speaker's charge indicator and protection circuits communicate correctly with the pack.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this battery through charge and discharge on a Charge 6 unit. The BMS accepted the pack without fault codes, the fuel gauge tracked state of charge accurately across the full range, and the USB-C PD input negotiated correctly at each charge stage.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eCharge cycle care for desk-top use:\u003c\/strong\u003e\n    For speakers used daily on a desk and topped off constantly, run a full discharge below 20% at least once a month before recharging. Continuous shallow cycling without a full discharge causes fuel gauge drift and accelerates capacity fade on the Li-ion cells.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the Charge 6 runs warm in its fabric housing during extended play\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe Charge 6 amplifier generates heat under sustained loud output, and the Li-ion cells add their own discharge heat on top of that. The fabric housing traps both heat sources together rather than venting them the way a vented enclosure would. Sustained temperatures above 40°C accelerate cell degradation over time. If the speaker feels hot to the touch during long sessions, drop the volume to reduce amplifier draw and give the housing a break from direct sunlight or enclosed surfaces.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eSpeaker won't wake from USB-C after sitting unused for weeks\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eA deeply discharged Li-ion pack can fall below the minimum acceptance voltage for USB-C PD negotiation — typically under 2.5V per cell. When the Charge 6 controller can't confirm a valid cell voltage, it won't initiate the charge handshake and the speaker appears completely dead. Plug into a USB-C source that supports 5V\/0.5A slow trickle — some chargers drop out because the speaker isn't responding with PD acknowledgement. Hold the connection for 15–20 minutes to allow trickle current to bring the cells back above 2.8V per cell before attempting a normal charge cycle.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43416179081306,"sku":"BWCS-JML600XL-1","price":56.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43416179114074,"sku":"BWCS-JML600XL-2","price":66.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43416179146842,"sku":"BWCS-JML600XL-3","price":74.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-JML600XL-1.webp?v=1779760588"},{"product_id":"jbl-charge-6-replacement-battery-74v-4500mah-li-ion","title":"JBL Charge 6 Replacement Battery 7.4V 4500mAh GSP-2S10-CH6A","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eJBL Charge 6 — 7.4V Li-ion Replacement Battery (GSP-2S10-CH6A)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 7.4V, 4500mAh Li-ion replacement battery for the JBL Charge 6 portable Bluetooth speaker. It replaces OEM part GSP-2S10-CH6A and restores the speaker's wireless audio and USB charging output when the original cell has degraded or failed. Capacity figure is 33.3Wh at the rated 7.4V nominal.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eCharge 6 fit and connector:\u003c\/strong\u003e\n    The Charge 6 uses a two-cell series Li-ion pack with a multi-pin connector that carries both cell balance data and temperature sensing. The BMS inside the speaker reads both signals on power-up — a pack missing either line will not initialise, so this replacement includes the matching harness and pin layout.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this pack on a Charge 6 unit through charge, full audio playback load, and USB passthrough output. The BMS accepted the cell chemistry handshake on first power-up, and the protection circuit tripped correctly at the low-cell-voltage cutoff threshold without nuisance shutdowns during normal draw.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eMonthly discharge cycle for Charge 6 users:\u003c\/strong\u003e\n    If the speaker sits on a desk and gets topped off before dropping below 50%, the fuel gauge drifts over weeks and the battery indicator becomes inaccurate. Run the speaker down below 20% at least once a month before recharging to recalibrate the gauge and slow capacity fade on the Li-ion cells.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the Charge 6 shows full charge but audio cuts out after extended play\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe Charge 6 amplifier draws a spike of current each time bass transients hit at high volume. If the Li-ion cells have degraded, internal resistance rises and voltage sags sharply under that spike — even when the fuel gauge still reads high. The speaker's protection circuit sees the sag as a low-voltage condition and shuts audio output before the indicator reaches empty. Replacing the pack with fresh cells lowers internal resistance and eliminates the sag that triggers the premature cutoff.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eUSB-C won't wake the Charge 6 when the battery is deeply discharged\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eUSB-C Power Delivery negotiation requires the device to pull a minimum voltage on the CC pins before the charger steps up to full charging voltage. If the Charge 6 battery has dropped below roughly 2.5V per cell, the BMS locks out output and the speaker cannot pull enough current to begin that handshake. The fix is to use a standard 5V USB-A cable first — this bypasses PD negotiation and trickle-charges the pack until cells recover above 3.0V per cell. Once the indicator LED blinks, switch back to the USB-C cable for normal charging.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43416179179610,"sku":"BWCS-JML600SL-1","price":49.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43416179212378,"sku":"BWCS-JML600SL-2","price":58.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43416179245146,"sku":"BWCS-JML600SL-3","price":64.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-JML600SL-1.webp?v=1779760588"},{"product_id":"philips-audio-fidelio-b971-replacement-battery-74v-2600mah-li-ion","title":"Philips SBAA00 Audio Fidelio B97\/1 Replacement Battery 7.4V","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003ePhilips Audio Fidelio B97\/1 — 7.4V Li-ion Replacement Battery (SBAA00)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 7.4V, 2600mAh Li-ion replacement battery for the Philips Audio Fidelio B97\/1, B97\/10, and Fidelio B9 portable Bluetooth speakers. It slots into the same position as the original SBAA00 pack and connects to the same BMS circuit. Capacity figures come from our product data — 2600mAh, 19.24Wh.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eFidelio B97 and B9 series fit:\u003c\/strong\u003e\n    The B97\/1, B97\/10, and Fidelio B9 share the same 7.4V dual-cell configuration and SBAA00 connector pinout. The BMS in each model expects the same charge termination voltage, so one battery covers all three without any wiring changes.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this pack through charge and discharge cycles on a B97 unit. The BMS accepted the cell, balanced both cells correctly, and the protection circuit tripped at the expected low-voltage cutoff — no error codes, no false fault states.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge calibration on the B97:\u003c\/strong\u003e\n    Let the speaker discharge below 20% at least once a month before recharging. Constant top-off charging without a full discharge cycle causes the onboard fuel gauge to drift, so the indicator reads full while actual capacity is significantly lower.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eBluetooth dropping at high volume on the Fidelio B97\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eAt high volume, the B97's amplifier and Bluetooth radio draw current simultaneously — this combined spike can pull cell voltage below the BMS sag threshold on a weakened pack. The BMS interprets the voltage dip as a fault and momentarily cuts output, which kills the radio link before audio recovers. A fresh 2600mAh cell holds voltage through those spikes more effectively than a degraded original. If drops persist after fitting a new battery, check that the speaker firmware is current — some early B97 firmware versions had aggressive BMS cutoff thresholds that Philips addressed in updates.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eAudio distorting before the battery indicator reaches empty\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis happens when the cell voltage sags under amplifier load but hasn't yet reached the threshold that triggers the battery indicator. The amplifier clips because it's not getting the full 7.4V it expects, producing audible distortion even though the display still shows charge remaining. It's a voltage delivery problem, not a capacity problem — the cell can't sustain the current draw at that state of charge. If a replacement pack still distorts at around 3.5V per cell under load, the amplifier board may have a separate fault worth checking before attributing it to the battery.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43416179277914,"sku":"BWCS-PHB970SL-1","price":39.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43416179310682,"sku":"BWCS-PHB970SL-2","price":46.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43416179343450,"sku":"BWCS-PHB970SL-3","price":51.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-PHB970SL_1.webp?v=1779760648"},{"product_id":"tronsmart-bang-replacement-battery-74v-7800mah-li-ion","title":"Tronsmart Bang Replacement Battery 7.4V 7800mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eTronsmart Bang — 7.4V Li-ion Replacement Battery (INR18650-3S2P)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 7.4V, 7800mAh Li-ion replacement battery for the Tronsmart Bang portable Bluetooth speaker. It slots into the Bang's battery bay to restore wireless operation when the original cell no longer holds a useful charge. Capacity is rated at 57.72Wh, matching the original pack specification.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eTronsmart Bang compatibility:\u003c\/strong\u003e\n    The Bang runs a 3S2P 18650 cell arrangement to hit the 7.4V nominal rail the amplifier board and Bluetooth module share. Any replacement must match that cell configuration and voltage, otherwise the BMS rejects the pack at handshake.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this pack through the Bang's charge controller and monitored BMS communication at full amplifier load. The protection circuit handled current spikes during loud audio playback without tripping the overcurrent cutoff.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eMonthly discharge cycle for the Bang:\u003c\/strong\u003e\n    The Bang is typically used at a desk or on a shelf and topped off constantly. Let the speaker drain below 20% at least once a month before recharging — continuous shallow cycling without a full discharge causes fuel gauge drift and accelerates cell capacity fade over time.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the Bang's audio distorts before the battery indicator hits empty\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eAt high volume, the amplifier draws enough current to sag the cell voltage below what the amp needs to drive the speaker cleanly. This happens before the fuel gauge reads zero because the gauge tracks stored charge, not instantaneous voltage under load. The result is audible clipping or distortion while the indicator still shows one or two bars. Keeping the pack above 15% charge under heavy playback avoids the voltage floor where sag-induced distortion starts.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eBang won't wake from USB-C after sitting discharged for weeks\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eIf the Bang is stored without use for several weeks, the cell voltage can drop below the USB-C PD minimum acceptance threshold, and the charge controller won't initiate a charge cycle. The speaker appears completely dead — no LED, no response. Use a USB-A to USB-C cable from a standard 5V charger rather than a PD adapter; the lower-voltage trickle from a basic 5V source often coaxes a deeply discharged Li-ion pack back above the recovery threshold. Once the LED flickers on, switch to the normal charger and complete a full charge cycle before use.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43416179376218,"sku":"BWCS-TRB100SL-1","price":49.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43416179408986,"sku":"BWCS-TRB100SL-2","price":58.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43416179441754,"sku":"BWCS-TRB100SL-3","price":64.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-TRB100SL-1.webp?v=1779760669"},{"product_id":"jbl-clip-5-replacement-battery-37v-1500mah-li-polymer","title":"JBL Clip 5 Portable Speaker Compatible Battery 3.7V 1500mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eJBL Clip 5 — 3.7V Li-Polymer Replacement Battery (GSP853450 01)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V, 1500mAh Li-Polymer battery for the JBL Clip 5 portable Bluetooth speaker. It fits directly in place of the original GSP853450 01 cell. If your Clip 5 no longer holds a charge or shuts off unexpectedly, this battery restores full function without replacing the whole unit.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eClip 5 fitment:\u003c\/strong\u003e\n    The Clip 5 uses a slim Li-Polymer pouch cell at 51.50 x 32.00 x 9.00mm. That exact footprint keeps the internal stack seated correctly against the speaker chassis — any dimensional mismatch causes flex stress on the solder tabs connecting the BMS to the main board.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell through charge and discharge cycles on the Clip 5 platform. The onboard BMS accepted the battery without error, voltage regulation held steady through both Bluetooth idle and active audio playback, and the fuel gauge tracked correctly from 100% to cutoff.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eMonthly discharge cycle on the Clip 5:\u003c\/strong\u003e\n    The Clip 5 is typically topped off daily on a desk or bag. Constant partial charging without a full discharge causes fuel gauge drift on the Li-Polymer cell. Run it below 20% at least once a month before recharging to keep the gauge accurate.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eAudio distortion before the Clip 5 battery indicator reaches empty\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eAs the cell ages and internal resistance rises, voltage sags under the combined draw of the amplifier and Bluetooth radio during loud playback. The amplifier hits its minimum operating voltage before the fuel gauge reads zero, so the speaker distorts or clips while the indicator still shows charge remaining. A fresh cell with lower internal resistance holds voltage stable under that combined load. If distortion starts above 20% charge on a new battery, check that the USB-C port is delivering a full charge cycle — partial charges from low-output ports accelerate early sag on the new cell.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eClip 5 won't respond to USB-C after sitting discharged for weeks\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eLi-Polymer cells that drop below approximately 2.5V enter a deep-discharge state the USB-C PD handshake won't recognise as a valid load. The speaker appears completely dead — no indicator light, no sound on connection. To recover, use a charger that outputs a continuous 5V with no PD negotiation required, and leave it connected for at least 30 minutes before the BMS wakes and allows normal charging to begin. If the cell has been below that threshold for an extended period, recovery may be incomplete and replacement is the only fix.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43416179474522,"sku":"BWCS-JMC500SL-1","price":39.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43416179507290,"sku":"BWCS-JMC500SL-2","price":46.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43416179540058,"sku":"BWCS-JMC500SL-3","price":51.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-JMC500SL-1.webp?v=1779760588"},{"product_id":"bose-soundlink-revolve-2-replacement-battery-74v-3400mah-li-ion","title":"Bose SoundLink Revolve+ 2 Replacement Battery 7.4V 3400mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eBose Soundlink Revolve+ 2 — 7.4V Li-ion Replacement Battery (080061)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 7.4V 3400mAh Li-ion battery replaces the original pack in the Bose Soundlink Revolve+ 2 portable Bluetooth speaker. It matches OEM part numbers 080061, 080065, and 829049-0210. If your speaker no longer holds charge or powers off unexpectedly, this is the direct cell swap.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eSoundlink Revolve+ 2 fit:\u003c\/strong\u003e\n    The Revolve+ 2 uses a two-cell series Li-ion pack at 7.4V nominal. The BMS inside the speaker handshakes with the pack over a dedicated data line — this battery carries the matching connector and cell configuration to pass that check without triggering a fault state.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this pack through charge and discharge on a Revolve+ 2 unit, confirmed BMS handshake completed, verified charge acceptance from 0% to full, and checked that the speaker's onboard fuel gauge reported capacity accurately across the full discharge curve.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration after swap:\u003c\/strong\u003e\n    After fitting a new pack, run the speaker down to auto-shutoff on the first cycle before recharging fully. Skipping this step leaves the fuel gauge calibrated to the old cell's profile, which causes the battery indicator to jump or report incorrectly from day one.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the Revolve+ 2 shuts off at high volume even on a charged battery\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eAt high volume, the amplifier pulls a sharp current spike on every bass transient. If the cell has aged, internal resistance has risen enough that these spikes cause the pack voltage to sag below the BMS cutoff threshold — even when the indicator shows 40% or more. The speaker interprets the voltage dip as a critically low cell and shuts down as a protection measure. A fresh 3400mAh pack with low internal resistance handles those transient draws without the sag, keeping voltage above the cutoff.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eSpeaker shows full charge but audio starts distorting before the battery indicator reaches empty\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis is amplifier clipping caused by voltage sag, not a software glitch. As a degraded cell discharges, voltage drops faster than the fuel gauge tracks — the amplifier hits its minimum supply voltage before the indicator reaches the low-battery zone. At that point the amp clips the audio waveform, producing crackling or distortion even though the display still shows bars remaining. Replacing the cell returns the discharge curve to spec and the amplifier gets clean voltage through the full cycle. Confirm the new pack is seated and the data connector is fully clicked before charging.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43416179638362,"sku":"BWCS-BSE861XL-1","price":59.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43416179671130,"sku":"BWCS-BSE861XL-2","price":70.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43416179703898,"sku":"BWCS-BSE861XL-3","price":78.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-BSE861XL-1.webp?v=1779760587"},{"product_id":"bose-soundlink-revolve-2-replacement-battery-74v-2600mah-li-ion","title":"Bose SoundLink Revolve+ 2 Replacement Battery 7.4V 2600mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eBose SoundLink Revolve+ 2 — 7.4V Li-ion Replacement Battery (080061)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 7.4V, 2600mAh Li-ion battery replaces the original pack in the Bose SoundLink Revolve+ 2 portable Bluetooth speaker. It fits OEM part numbers 080061, 080065, and 829049-0210. When the original cell degrades after repeated charge cycles, swapping this pack restores full speaker function without replacing the entire unit.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eSoundLink Revolve+ 2 fit:\u003c\/strong\u003e\n    The Revolve+ 2 uses a dual-cell 7.4V pack with a proprietary BMS handshake that monitors cell balance and communicates state-of-charge to the speaker firmware. This replacement matches that voltage rail and connector pinout so the speaker's charge indicator and protection circuit operate as expected.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this pack through charge and discharge on the Revolve+ 2 platform and confirmed the BMS completed full charge termination without fault codes. Cell balance across both cells remained within 20mV at top-of-charge.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eMonthly discharge cycle for the Revolve+ 2:\u003c\/strong\u003e\n    If this speaker sits on a desk and gets topped off daily, discharge it below 20% at least once a month before recharging. Constant shallow cycling causes fuel gauge drift — the charge indicator reads full while actual capacity has already dropped significantly.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eAudio distorting before the battery indicator reaches empty on the Revolve+ 2\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe Revolve+ 2 amplifier draws a sharp current spike at high volume. As the cell ages and internal resistance rises, that spike causes a voltage sag that the amplifier sees before the BMS triggers low-battery cutoff. The speaker clips the audio signal to protect the amp — which sounds like distortion or a crackling output — even though the indicator still shows remaining charge. A fresh cell with lower internal resistance eliminates the sag. After fitting this replacement, confirm the speaker plays clean at full volume down to below 3.5V per cell before the low-battery warning appears.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eRevolve+ 2 won't wake from USB-C when the pack has been deeply discharged\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eLi-ion cells that drop below roughly 2.5V per cell fall outside the minimum acceptance voltage for USB-C Power Delivery negotiation. The charger and speaker exchange no handshake, so the LED stays dark and the speaker appears completely dead. Connect the original Bose charging cable — not a third-party USB-C PD charger — and leave it for 20 to 30 minutes without interruption. The onboard pre-charge circuit trickle-feeds the cell back above the PD threshold, after which normal charging resumes. If the LED still shows no activity after 30 minutes, the cell has been held below 2.5V long enough that recovery is unlikely and the pack needs replacement.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43416179769434,"sku":"BWCS-BSE861SL-1","price":53.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43416179802202,"sku":"BWCS-BSE861SL-2","price":63.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43416179834970,"sku":"BWCS-BSE861SL-3","price":70.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-BSE861SL-1.webp?v=1779760587"},{"product_id":"audio-technica-at-sb727-replacement-battery-37v-2600mah-li-ion","title":"Audio-Technica LI-210 Portable Speaker Compatible Battery 3.7V 2600mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eAudio-Technica AT-SB727 Sound Burger — 3.7V Li-ion Replacement Battery (LI-210)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThe LI-210 is a 3.7V, 2600mAh Li-ion cell that powers the Audio-Technica AT-SB727 Sound Burger portable turntable speaker. It replaces the original pack when the unit no longer holds a charge or cuts out during playback. Dimensions are 65.70 × 21.50 × 18.30mm — confirm these against your existing cell before ordering.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eAT-SB727 and AUATSB727 compatibility:\u003c\/strong\u003e\n    Both model designations use the same LI-210 pack. The voltage rail, connector pinout, and BMS handshake are identical across the AT-SB727 and AUATSB727 variants, so one cell fits both.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled the LI-210 through charge and discharge on the AT-SB727 platform. The BMS held protection thresholds correctly — no false overcurrent trips, no undervoltage cutoff at idle draw, and charge termination landed at the expected 4.2V cell ceiling.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eMonthly discharge cycle for the AT-SB727:\u003c\/strong\u003e\n    This unit gets left on a desk and topped off constantly. That shallow cycling causes fuel gauge drift — the indicator reads full while actual capacity is 60% or less. Run the speaker down below 20% at least once a month before recharging to reset the fuel gauge and slow capacity fade on the Li-ion cell.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eBluetooth dropping at high volume on a new LI-210\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eAt high volume the AT-SB727 amplifier draws a spike of current on top of the constant Bluetooth radio draw. If the cell has any internal resistance — even on a new pack that was shipped in partial-charge state — the combined load causes a momentary voltage sag. The BMS reads that sag as an undervoltage event and briefly cuts the radio before the amp recovers. Charge the LI-210 fully to 4.2V before first use; that sag window narrows significantly on a fully conditioned cell.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eAudio distorting before the battery indicator reaches empty\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe AT-SB727 amplifier begins clipping when cell voltage drops below roughly 3.5V, even though the indicator may still show one or two bars. The battery gauge uses a voltage-to-capacity curve that can drift after months of shallow cycling, so the display lags behind real cell state. You hear the distortion first — it is not a speaker fault. Swap in a charged LI-210 and confirm voltage at the cell terminals reads 3.7V or above before ruling out the amplifier.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43416179867738,"sku":"BWCS-ASB727SL-1","price":36.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43416179900506,"sku":"BWCS-ASB727SL-2","price":42.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43416179933274,"sku":"BWCS-ASB727SL-3","price":47.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-ASB727SL-1.webp?v=1779760586"},{"product_id":"lg-xboom-go-xg9-replacement-battery-148v-6700mah-li-ion","title":"LG XBOOM Go XG9 Compatible Battery 14.8V 6700mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eLG XBOOM Go XG9 — 14.8V Li-ion Replacement Battery (EAC64790801)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 14.8V, 6700mAh Li-ion battery for the LG XBOOM Go XG9 portable Bluetooth speaker. It replaces OEM part EAC64790801 and IBA007GA. Fits XG9QBK.ABRALLB, XG9QBK.ABRALLK, XG9QBK.DEUSLLB, and related XG9 variants.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eXG9 speaker platform fit:\u003c\/strong\u003e\n    These XG9 model codes all share the same 14.8V battery rail, connector type, and BMS handshake protocol. The cell configuration and communication lines are identical across the variant suffixes, so one pack covers the full XG9 lineup.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this pack through charge and discharge cycles on the XG9 platform. The BMS negotiated correctly on first connection — no fault codes, no false low-battery flags, and the fuel gauge tracked accurately across the full charge range.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eMonthly discharge cycle for XG9 users:\u003c\/strong\u003e\n    If the XG9 lives on a desk and gets topped off constantly, discharge it below 20% at least once a month before recharging. Constant shallow cycling without a full discharge causes fuel gauge drift on this cell configuration and accelerates capacity fade faster than normal use would.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eAudio distorting before the battery indicator reaches empty on the XG9\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe XG9 amplifier draws a significant current spike during loud playback. When the cell is aged or degraded, internal resistance rises and voltage sags under that spike — dropping below the amplifier's clean operating threshold before the fuel gauge reads empty. The speaker clips the audio signal because the amp is starved of voltage, not because the battery is truly flat. A fresh cell with lower internal resistance maintains the voltage rail under high-draw conditions, eliminating the distortion before the gauge reaches critical.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eXG9 not accepting a charge after sitting unused for several months\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eLi-ion cells left uncharged for extended periods can self-discharge below the USB-C PD minimum acceptance voltage — typically around 2.5V per cell. When the pack drops that low, the BMS blocks charging as a protection measure and the speaker appears completely dead. To recover it, connect the charger and leave it for 15–20 minutes without interruption — most BMS circuits trickle-charge the cell back above the threshold before allowing full current. If the indicator still shows nothing after 30 minutes of continuous connection, confirm the cable and adaptor are supplying at least 9V DC input.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43416179966042,"sku":"BWCS-LPX900XL-1","price":74.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43416179998810,"sku":"BWCS-LPX900XL-2","price":87.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43416180031578,"sku":"BWCS-LPX900XL-3","price":96.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-LPX900XL-1.webp?v=1779760648"},{"product_id":"lg-xboom-go-xg9-replacement-battery-148v-5200mah-li-ion","title":"LG XBOOM Go XG9 Replacement Battery 14.8V 5200mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eLG XBOOM Go XG9 — 14.8V Li-ion Replacement Battery (EAC64790801)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 14.8V, 5200mAh Li-ion replacement battery for the LG XBOOM Go XG9 portable Bluetooth speaker. It fits XG9QBK variants including ABRALLB, ABRALLK, and DEUSLLB. Swap it when the original pack no longer holds enough charge to get you through a full session away from mains power.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eXG9 variant compatibility:\u003c\/strong\u003e\n    All listed XG9QBK variants share the same 14.8V battery bay, connector pinout, and BMS communication protocol. The cell count and voltage rail are identical across the regional SKUs, so one pack covers the full XG9 family.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this pack through charge and discharge on the XG9 platform and confirmed the BMS handshake completed without fault codes. Cell balancing across the four Li-ion cells settled within spec after the second full cycle.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eMonthly discharge for fuel gauge accuracy:\u003c\/strong\u003e\n    If the XG9 lives on a desk and gets topped off constantly, discharge it below 20% at least once a month before recharging. Constant shallow cycling causes the fuel gauge IC to drift, so the speaker reports full charge while actual usable capacity quietly drops.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eAudio distortion before the battery indicator reaches empty on the XG9\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe XG9 amplifier draws a sharp current spike when reproducing bass-heavy content at high volume. As the Li-ion pack ages and internal resistance climbs, voltage sags under that spike before the fuel gauge registers low battery. The amplifier clips the output signal to protect itself, and you hear distortion well before the indicator flashes empty. A fresh pack with lower internal resistance eliminates the sag — at 14.8V nominal, the amplifier stays above its minimum rail voltage even under peak draw.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eUSB-C charging not starting on a deeply discharged XG9 pack\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eIf the XG9 has sat unused for weeks, the cell voltage can drop below the USB-C Power Delivery minimum acceptance threshold, and the charger will not negotiate a session — the indicator stays dark and nothing happens. The BMS needs a trickle pre-charge to bring the cells back above roughly 2.5V per cell before it will allow a standard charge cycle. Connect the speaker to a USB-C charger rated at least 18W and leave it untouched for 20–30 minutes — the BMS will begin pre-charge recovery on its own without any reset step required.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43416180064346,"sku":"BWCS-LPX900SL-1","price":68.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43416180097114,"sku":"BWCS-LPX900SL-2","price":80.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43416180129882,"sku":"BWCS-LPX900SL-3","price":88.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-LPX900SL-1.webp?v=1779760649"},{"product_id":"bose-soundlink-flex-replacement-battery-37v-3400mah-li-ion","title":"Bose SoundLink Flex 83289 Replacement Battery 3.7V 3400mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eBose SoundLink Flex — 3.7V Li-ion Replacement Battery (83289)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V, 3400mAh (12.58Wh) Li-ion replacement battery for the Bose SoundLink Flex portable Bluetooth speaker. It replaces OEM part number 83289. Fit this battery when the original cell no longer holds a charge or the speaker shuts down unexpectedly during playback.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eSoundLink Flex platform fit:\u003c\/strong\u003e\n    The SoundLink Flex uses a single-cell Li-ion pack at 3.7V nominal, matched to its onboard charging and protection circuit. This replacement cell matches that voltage rail and physical connector, so the BMS handshake completes without error flags on the speaker's firmware.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell through charge and discharge cycles on the SoundLink Flex platform. The BMS accepted the pack immediately, charge termination triggered correctly at 4.2V, and low-voltage cutoff engaged at the expected threshold without forcing a hard shutdown during audio output.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge reset after install:\u003c\/strong\u003e\n    After fitting a new cell, the SoundLink Flex's fuel gauge may read inaccurately for the first few cycles. Run the speaker down to the low-battery warning before recharging — do this for the first two full cycles to let the coulomb counter recalibrate against the actual cell capacity.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eCapacity fade from constant top-off charging on the SoundLink Flex\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eMost SoundLink Flex users plug the speaker in at a desk whenever it drops below full. That habit keeps the cell sitting at 4.2V for long periods, which accelerates lithium plating on the anode and reduces usable capacity over time. The original 3400mAh cell can drop to effective capacity well under 2000mAh within 18 months under this pattern. Once per month, let the speaker play down past the low-battery indicator before recharging — this breaks the shallow-cycle pattern that kills the cell early.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eSoundLink Flex won't wake from USB-C after sitting discharged for weeks\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eIf the speaker is stored without charging, the Li-ion cell can drop below the USB-C Power Delivery minimum acceptance voltage — typically under 2.5V per cell. At that level, the PD controller in the speaker won't negotiate a charging contract and the speaker appears completely dead. Connect the USB-C cable and leave it for 15–20 minutes without pressing any button — some chargers will trickle current into a deeply discharged cell before PD negotiation starts. If the cell has dropped below 2.0V, recovery is not always possible and the cell needs replacement. Check for a faint LED pulse after that wait period as confirmation the pack is accepting charge.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43416180949082,"sku":"BWCS-BSL289XL-1","price":49.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43416180981850,"sku":"BWCS-BSL289XL-2","price":58.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43416181014618,"sku":"BWCS-BSL289XL-3","price":64.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-BSL289XL-1.webp?v=1779760587"},{"product_id":"bose-soundlink-flex-replacement-battery-37v-2600mah-li-ion","title":"Bose SoundLink Flex 3.7V Replacement Battery 83289","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eBose SoundLink Flex — 3.7V Li-ion Replacement Battery (83289)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 3.7V, 2600mAh (9.62Wh) Li-ion cell replaces the original battery in the Bose SoundLink Flex portable Bluetooth speaker. It fits OEM part number 83289 directly. If your SoundLink Flex no longer holds a charge or powers on, this cell restores the speaker to working condition.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eSoundLink Flex platform fit:\u003c\/strong\u003e\n    The SoundLink Flex uses a single-cell 3.7V Li-ion pack with a proprietary connector and an integrated BMS that communicates charge state to the speaker's firmware. This cell matches that voltage rail and connector so the speaker's charge indicator reports accurately after installation.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell through charge and discharge cycles on the SoundLink Flex platform. The BMS handshake completed without error codes, and the charge indicator tracked correctly from 0% to 100% across multiple cycles.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge reset after swap:\u003c\/strong\u003e\n    After fitting this cell, run the speaker down to auto-shutdown before the first recharge. Skipping this step causes the SoundLink Flex firmware to read stale capacity data from the old pack, which produces inaccurate battery percentage readings from the first charge.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eAudio distorting before the battery indicator reaches empty\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe SoundLink Flex amplifier draws a surge of current at high volume. When the cell approaches the end of its discharge curve, internal resistance causes voltage to sag under that load — even if the indicator still shows 10–20% remaining. The amplifier clips because it cannot sustain rail voltage, and the audio distorts before the speaker shuts down. If this happens on a new cell, run a full discharge-to-shutdown cycle and recharge to 100% to let the BMS recalibrate its capacity reading.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eSoundLink Flex won't wake from USB-C after sitting unused for weeks\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eA deeply discharged Li-ion cell can drop below the minimum acceptance voltage for USB-C Power Delivery negotiation. When that happens, the charger sees no valid handshake and delivers no current, so the speaker appears completely dead. The fix is to connect the speaker to a basic 5V USB-A source using a USB-A to USB-C cable rather than a PD charger — this bypasses the PD negotiation and trickle-charges the cell back above the recovery threshold of approximately 3.0V per cell. Once the cell recovers, switch to the standard USB-C charger to complete the charge cycle.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43416182095962,"sku":"BWCS-BSL289SL-1","price":43.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43416182128730,"sku":"BWCS-BSL289SL-2","price":51.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43416182161498,"sku":"BWCS-BSL289SL-3","price":56.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-BSL289SL_1.webp?v=1779760587"},{"product_id":"pliant-microcom-xr-replacement-battery-37v-900mah-li-polymer","title":"Pliant MicroCom XR Replacement Battery 3.7V 900mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003ePliant MicroCom XR Series — 3.7V Li-Polymer Replacement Battery (031-450-3048)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 3.7V, 900mAh Li-Polymer battery replaces the OEM cell in the Pliant MicroCom XR and MicroCom XR900 all-in-one headset. It slots into the same footprint as the original at 53.20 × 34.00 × 6.20mm. If your unit cuts out early or won't hold a charge, this is the cell to swap.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eMicroCom XR and XR900 compatibility:\u003c\/strong\u003e\n    Both the MicroCom XR and XR900 share the same battery bay dimensions, connector pinout, and 3.7V nominal rail — one cell fits both variants without modification.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell through charge and discharge on the MicroCom XR platform. The BMS accepted full charge without fault flags and held voltage steady through audio playback draw at the amplifier rail.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eMonthly discharge cycle for MicroCom XR users:\u003c\/strong\u003e\n    Let the battery run below 20% at least once a month before plugging in. The MicroCom XR spends most of its life topped off on a desk charger — constant shallow cycling causes fuel gauge drift, so the indicator reads full while actual capacity has quietly dropped.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eAudio distortion before the battery indicator reaches empty on the MicroCom XR\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eAs a Li-Polymer cell ages, its internal resistance rises. Under the combined draw of the amplifier and Bluetooth radio, voltage sags faster than the fuel gauge tracks. The amplifier rail drops below the threshold needed to drive clean output, and you hear clipping or crackle while the indicator still shows charge remaining. Swapping in a fresh 900mAh cell with lower internal resistance restores clean headroom to the amp rail.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eMicroCom XR won't wake from USB after sitting discharged\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eIf the unit sits unused for several weeks with no charge, the cell can drop below the USB charge controller's minimum acceptance voltage — typically around 2.5V for Li-Polymer. At that point the controller sees an out-of-range cell and refuses to start a charge cycle. Connect to a USB port and hold the power button for 10–15 seconds to trigger a low-current pre-charge handshake. If the device still shows no charging activity after two minutes, the cell has likely dropped below recovery threshold and replacement is the correct fix.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43416182194266,"sku":"BWCS-PMR900SL-1","price":33.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43416182227034,"sku":"BWCS-PMR900SL-2","price":39.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43416182259802,"sku":"BWCS-PMR900SL-3","price":43.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-PMR900SL-1.webp?v=1779760648"},{"product_id":"lg-pk3-replacement-battery-37v-5200mah-li-polymer","title":"LG PK3 Replacement Battery 3.7V 5200mAh Li-Polymer EAC63918501","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eLG PK3 Portable Speaker — 3.7V Li-Polymer Replacement Battery (EAC63918501)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 3.7V, 5200mAh Li-Polymer battery replaces the original EAC63918501 cell inside the LG PK3, PK3-N, and PK3-N.ABRALLK portable Bluetooth speakers. It fits the exact footprint at 97.00 × 28.50 × 16.00mm and connects directly to the speaker's charge management board. Replace this battery when the original no longer holds a charge or the speaker fails to power on.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003ePK3 and PK3-N compatibility:\u003c\/strong\u003e\n    All three listed variants — PK3, PK3-N, and PK3-N.ABRALLK — share the same battery bay dimensions, connector pinout, and charge IC. One cell fits all three without modification.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell through the PK3's charge board and confirmed the protection circuit communicates correctly with the onboard BMS — charge termination and over-discharge cutoff both triggered at expected thresholds.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eMonthly discharge cycle for the PK3:\u003c\/strong\u003e\n    The PK3 is typically left on a desk and topped off constantly. Let the battery discharge below 20% at least once a month before plugging in — constant shallow charging without a full discharge causes fuel gauge drift and accelerates capacity fade on the Li-Polymer cell.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eAudio distorting before the battery indicator reaches empty on the PK3\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eAs a Li-Polymer cell ages, its internal resistance rises. Under the combined current draw of the amplifier and Bluetooth radio, voltage sags faster than the fuel gauge can track. The amplifier hits its minimum supply voltage before the indicator shows low battery, causing clipping and distortion. A new cell at full 5200mAh capacity restores the voltage headroom the amplifier needs at high output.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003ePK3 not waking from USB-C after sitting unused for several weeks\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eLi-Polymer cells self-discharge during storage. If the PK3 sits unused long enough, the cell can drop below the minimum voltage the USB-C PD negotiation requires to begin a charge session — typically around 2.5V. The charge IC sees a cell voltage too low to accept standard input and refuses to start. Connect the speaker to a 5V USB-A charger instead of USB-C, which bypasses PD negotiation and trickle-charges the cell back above 3.0V before normal charging resumes.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43416182849626,"sku":"BWCS-LPX300SL-1","price":39.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43416182882394,"sku":"BWCS-LPX300SL-2","price":46.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43416182915162,"sku":"BWCS-LPX300SL-3","price":51.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-LPX300SL-1.webp?v=1779760648"},{"product_id":"bose-s1-pro-replacement-battery-144v-6800mah-li-ion","title":"Bose S1 Pro 14.4V Replacement Battery 789175","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eBose S1 Pro Multi-Position PA System — 14.4V Li-ion Replacement Battery (789175)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 14.4V 6800mAh Li-ion battery replaces OEM part 789175 in the Bose S1 Pro, S1 Pro System, and S1 Pro Multi-Position PA System. It restores full portable operation when the original cell can no longer hold a usable charge. At 97.92Wh, it matches the energy capacity the S1 Pro amplifier expects from a healthy pack.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eS1 Pro platform fit:\u003c\/strong\u003e\n    All three S1 Pro variants — S1 Pro, S1 Pro System, and S1 Pro Multi-Position PA System — share the same battery bay geometry, connector pinout, and BMS communication protocol. One battery fits all three without modification.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this pack through charge and discharge cycles on the S1 Pro. The BMS handshook correctly, the fuel gauge reported accurately from 100% down to the low-battery cutoff, and the amplifier showed no mid-cycle shutdown.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eMonthly discharge cycle on the S1 Pro:\u003c\/strong\u003e\n    If the S1 Pro sits on a desk and gets topped off constantly before dropping below 50%, the fuel gauge drifts and capacity fades faster than normal cycling. Let the pack run below 20% at least once a month before recharging to keep the cell calibration accurate.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eAudio distorting before the S1 Pro battery indicator reaches empty\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eWhen the pack is aged or a replacement cell has higher internal resistance than the original, voltage sags under the combined amplifier and radio draw before the battery gauge triggers the low-battery warning. The amplifier hits its minimum rail voltage and clips the signal first. This produces audible distortion — usually at higher volumes — while the indicator still shows one or two bars. Check resting voltage at that point: if it reads below 13.5V under load, the cell is sagging too hard and needs replacement.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eS1 Pro showing full charge bars but audio drops out after extended play\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis is fuel gauge drift — common in packs that have been shallow-cycled for months without a full discharge. The cell's actual state of charge diverges from what the BMS reports, so the indicator reads full while the usable capacity is significantly lower. A full discharge to the S1 Pro's automatic cutoff, followed by an uninterrupted charge to 100%, forces the BMS to recalibrate its charge estimation. If the symptom persists after two full cycles, the cell has degraded past recovery and replacement is the correct fix.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43416183996506,"sku":"BWCS-BSS100XL-1","price":208.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43416184029274,"sku":"BWCS-BSS100XL-2","price":248.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43416184062042,"sku":"BWCS-BSS100XL-3","price":277.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-BSS100XL_1.webp?v=1779760587"},{"product_id":"sony-gtk-xb90-replacement-battery-216v-3400mah-li-ion","title":"Sony GTK-XB90 Replacement Battery 21.6V 3400mAh Li-ion","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eSony GTK-XB90 — 21.6V Li-ion Replacement Battery (1-853-679-11)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 21.6V, 3400mAh Li-ion battery replaces the original pack in the Sony GTK-XB90 portable wireless speaker. It fits directly into the GTK-XB90 chassis and restores full audio playback and Bluetooth operation. Capacity figure is 73.44Wh, matching the OEM spec.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eGTK-XB90 pack architecture:\u003c\/strong\u003e\n    The GTK-XB90 runs a high-voltage Li-ion stack to feed both the Class D amplifier and the Bluetooth radio from a single pack. The 21.6V rail is specific to this model's power board — lower-voltage generic speaker packs will not satisfy the BMS handshake and the speaker will not power on.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this battery through repeated audio loads at the GTK-XB90's maximum output setting. The BMS held the 21.6V rail steady through amplifier current spikes and did not trip on combined amp-plus-radio draw.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration on the GTK-XB90:\u003c\/strong\u003e\n    Let the speaker discharge below 20% at least once a month before recharging. Constant top-off charging without a full discharge cycle causes fuel gauge drift — the indicator reads full while actual cell capacity is significantly lower.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eAudio distortion before the battery indicator reaches empty on the GTK-XB90\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eAs cell voltage drops under sustained high-volume load, the amplifier's supply rail sags before the BMS triggers low-battery cutoff. The amplifier clips at that reduced rail voltage, producing audible distortion even though the indicator still shows charge remaining. This is a voltage sag symptom, not a speaker fault. A worn or deeply cycled pack will show this earlier in the discharge curve — a fresh, fully charged cell holds the 21.6V rail long enough that distortion stays out of the usable listening range.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eGTK-XB90 won't charge after the battery fully drained\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eWhen the cell voltage drops below the USB-PD minimum acceptance threshold — typically around 2.5V per cell — the BMS locks out charging to prevent an unsafe recovery attempt. The speaker shows no charge indicator and appears completely dead. To recover, connect the charger and leave it undisturbed for 15–20 minutes — the BMS on this pack includes a trickle pre-charge stage that slowly brings the cells back up to a safe voltage before switching to normal charge current. If the indicator still shows nothing after 30 minutes, check that the supply voltage at the socket measures above 20V before assuming pack failure.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43416184094810,"sku":"BWCS-SXB900XL-1","price":85.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43416184127578,"sku":"BWCS-SXB900XL-2","price":100.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43416184160346,"sku":"BWCS-SXB900XL-3","price":111.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-SXB900XL-1.webp?v=1779760649"},{"product_id":"sony-gtk-xb90-replacement-battery-216v-2600mah-li-ion","title":"Sony GTK-XB90 Replacement Battery 21.6V 2600mAh Li-ion","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eSony GTK-XB90 — 21.6V Li-ion Replacement Battery (1-853-679-11)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 21.6V 2600mAh (56.16Wh) Li-ion replacement battery for the Sony GTK-XB90 portable Bluetooth party speaker. It fits directly in place of OEM part 1-853-679-11 (also cross-referenced as LIP6332HNPC). Replace it when your GTK-XB90 no longer holds a charge or shuts down mid-session.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eGTK-XB90 compatibility:\u003c\/strong\u003e\n    The GTK-XB90 uses a multi-cell Li-ion pack at 21.6V nominal to drive both its Class-D amplifier and Bluetooth radio from a single source. This replacement matches that voltage rail and carries the same BMS handshake the speaker's charge controller expects.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this pack through charge and discharge on the GTK-XB90 platform. The BMS responded correctly to charge termination, cell balancing, and over-discharge cutoff without triggering fault states on the speaker's charge controller.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eMonthly discharge cycle for GTK-XB90 users:\u003c\/strong\u003e\n    Let the speaker run down below 20% at least once a month before recharging. The GTK-XB90 is often kept plugged in between events — constant top-off charging without a full discharge causes fuel gauge drift and accelerates capacity fade in the Li-ion cells.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eAudio distortion before the GTK-XB90 battery indicator reaches empty\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eAs the pack discharges toward its lower voltage threshold, the available current drops. The GTK-XB90's amplifier draws significant current at high volume, and when pack voltage sags under that load, the amp clips before the fuel gauge registers empty. The battery indicator reflects resting voltage, not loaded voltage — so the gauge can show two bars while the amplifier is already starved. If distortion appears consistently at the same volume level late in a session, the pack is sagging below roughly 18V under load and needs replacement.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eGTK-XB90 warm to the touch during extended play sessions\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe GTK-XB90 houses the battery directly beneath the amplifier stage inside a sealed fabric-wrapped enclosure. Heat from the amp and heat from the discharging Li-ion cells combine in a space with limited airflow. Mild warmth is normal, but if the cabinet becomes hot enough to feel uncomfortable through the fabric, the BMS thermal protection may throttle output or trigger a shutdown before the pack is empty. Keep the speaker off soft surfaces like sofas or carpets during long sessions — hard flat surfaces allow the base vents to breathe and reduce thermal buildup inside the housing.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43416184717402,"sku":"BWCS-SXB900SL-1","price":81.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43416184750170,"sku":"BWCS-SXB900SL-2","price":95.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43416184782938,"sku":"BWCS-SXB900SL-3","price":106.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-SXB900SL-1.webp?v=1779760649"},{"product_id":"denon-envaya-dsb-200-replacement-battery-74v-2600mah-li-ion","title":"Denon Envaya DSB-200 Replacement Battery 7.4V 2600mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eDenon Envaya DSB-200 — 7.4V Li-ion Replacement Battery (CABICR18650-2400)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 7.4V 2600mAh Li-ion replacement battery for the Denon Envaya DSB-200 portable Bluetooth speaker. It slots into the same position as the original cell pack and runs through the same BMS communication lines. Capacity is rated at 19.24Wh — matching the original specification.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eEnvaya DSB-200 fitment:\u003c\/strong\u003e\n    The DSB-200 uses a dual-cell 7.4V pack with a specific connector pinout that handles both power delivery and charge state reporting. This battery matches that pinout, so the speaker's onboard fuel gauge reads correctly from the first charge cycle.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran the pack through charge and discharge cycles on the DSB-200 platform. The BMS handled cell balancing correctly, and the speaker's charge indicator tracked accurately across the full voltage range without false full or false empty readings.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eMonthly discharge cycle for DSB-200 users:\u003c\/strong\u003e\n    If the speaker sits on a desk and gets topped off constantly, let it run down below 20% at least once a month before recharging. The DSB-200's fuel gauge drifts when the cells never see a full discharge, which causes the battery indicator to cut out earlier than the actual cell capacity warrants.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the DSB-200 shows full charge but audio drops after extended play\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe DSB-200 amplifier draws a spike of current every time bass frequencies hit at volume. An aged or degraded cell pack cannot sustain that spike without voltage sagging below the amplifier's operating threshold. The speaker interprets this sag as a low-battery condition and cuts output to protect the circuit, even though the fuel gauge still shows charge remaining. A fresh cell pack with lower internal resistance handles those transient current spikes without triggering the cutoff.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eSpeaker won't wake from USB charging after sitting unused for weeks\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eWhen the DSB-200 sits discharged for an extended period, the cell voltage can drop below the USB-C PD minimum acceptance threshold — typically under 2.5V per cell. At that voltage, the charger handshake fails and the speaker appears completely dead at the USB port. Connect the speaker to a 5V USB-A charger instead of USB-C, hold the power button for 10 seconds, and allow 30 minutes before attempting a full charge cycle. This initiates a trickle pre-charge that brings the cells back above the PD acceptance floor.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43416184815706,"sku":"BWCS-DED200SL-1","price":43.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43416184848474,"sku":"BWCS-DED200SL-2","price":51.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43416184881242,"sku":"BWCS-DED200SL-3","price":56.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-DED200SL_1.webp?v=1779760588"},{"product_id":"akg-s30-replacement-battery-38v-3200mah-li-polymer","title":"AKG S30 Replacement Battery 3.8V 3200mAh AHB705363","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eAKG S30 — 3.8V Li-Polymer Replacement Battery (AHB705363)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 3.8V, 3200mAh Li-Polymer cell replaces the original AHB705363 battery in the AKG S30 portable Bluetooth speaker. It restores full audio playback capability when the original pack has degraded or failed. Voltage and capacity match the S30's power management circuit exactly.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eAKG S30 fit:\u003c\/strong\u003e\n    The S30 runs a single-cell Li-Polymer architecture at 3.8V nominal. The onboard BMS expects that voltage rail and a specific charge termination profile — this cell meets both, so the fuel gauge reads correctly from first charge.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this pack through charge and discharge on the S30 platform. The BMS accepted the cell without fault flags, charge termination triggered at the correct cutoff voltage, and the protection circuit tripped cleanly under simulated over-discharge conditions.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eMonthly full-discharge cycle on the S30:\u003c\/strong\u003e\n    The S30 is typically kept plugged in on a desk or shelf. Constant top-off charging without a full discharge causes fuel gauge drift and accelerates capacity fade on the Li-Polymer cell. Run the speaker down below 20% at least once a month before recharging to keep the gauge accurate.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eAudio distorting before the S30 battery indicator reaches empty\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eAs a Li-Polymer cell ages, its internal resistance rises. Under the amplifier's current draw, voltage sags below the threshold the amp needs for clean output — even though the indicator still shows charge remaining. The result is clipping and distortion in the audio signal before the battery LED ever warns you. Replacing the cell drops internal resistance back to spec, and the amp gets a stable supply voltage above 3.5V through the discharge curve.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eS30 won't wake from USB-C after sitting uncharged for weeks\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eA deeply discharged Li-Polymer cell can fall below the minimum acceptance voltage for USB-C Power Delivery negotiation — typically under 2.5V. At that level, the charger initiates a handshake the BMS cannot complete, and the speaker appears dead on the cable. Connect the S30 to a USB-A port using a standard 5V charger instead of a USB-C PD source — the lower-voltage trickle feeds the cell back above the PD floor. Once the cell recovers to around 3.0V, normal USB-C charging resumes.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43416184914010,"sku":"BWCS-AKS300SL-1","price":32.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43416184946778,"sku":"BWCS-AKS300SL-2","price":37.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43416184979546,"sku":"BWCS-AKS300SL-3","price":41.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-AKS300SL-1.webp?v=1779760586"},{"product_id":"lg-xboom-xg8t-replacement-battery-148v-2600mah-li-ion","title":"EAC64790802 LG XBOOM XG8T Replacement Battery 14.8V 2600mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eLG XBOOM XG8T — 14.8V Li-ion Replacement Battery (EAC64790802)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 14.8V, 2600mAh (38.48Wh) Li-ion replacement battery for the LG XBOOM XG8T portable Bluetooth speaker. It slots into the XG8T's battery bay and restores untethered playback when the original cell has degraded. Voltage and connector match the OEM spec for this model.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eXBOOM XG8T platform fit:\u003c\/strong\u003e\n    The XG8T runs a 14.8V four-cell Li-ion pack that feeds both the amplifier board and the Bluetooth radio through a shared power rail. A drop in cell voltage affects both simultaneously — audio and wireless signal degrade together. This battery maintains the same voltage curve the XG8T's BMS expects across that shared rail.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this pack through charge and discharge on the XG8T and monitored the BMS handshake. The protection circuit responded correctly to charge termination and low-voltage cutoff. No false low-battery flags appeared during the test cycles.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration tip:\u003c\/strong\u003e\n    The XG8T uses a fuel gauge IC that drifts when the battery is never fully discharged. Let the speaker run down to below 20% at least once a month before plugging in — skipping full discharge cycles causes the gauge to report inaccurate charge levels, which can trigger premature shutdowns even when cell capacity is still good.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eAudio distorting before the battery indicator reaches empty on the XG8T\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe XG8T amplifier draws a sharp current spike at high volume. As the Li-ion cell ages and its internal resistance rises, that spike causes a voltage sag across the pack. The amplifier clips before the battery indicator registers low because the BMS reads resting voltage, not loaded voltage. Replacing the cell restores the pack's ability to hold voltage under load — check that the resting voltage reads at least 15.8V after a full charge before testing at volume.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eXG8T won't wake from USB-C charging after sitting unused for months\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eLi-ion cells self-discharge during storage. If the XG8T sits unused for several months, the pack can drop below the USB-C PD minimum acceptance threshold — typically around 2.5V per cell, or roughly 10V for a four-cell pack. At that voltage, the BMS locks out charging to protect the cells, and the charger sees no handshake. Use a bench charger or a compatible Li-ion recovery charger to apply a trickle charge at 0.1C to bring the pack above 12V, then switch to the standard USB-C charger to complete the cycle.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43416186323034,"sku":"BWCS-LPX800SL-1","price":53.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43416186355802,"sku":"BWCS-LPX800SL-2","price":63.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43416186388570,"sku":"BWCS-LPX800SL-3","price":70.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-LPX800SL-1.webp?v=1779760648"},{"product_id":"jbl-partybox-club-120-replacement-battery-54v-4500f-hpc","title":"JBL PartyBox Club 120 Compatible Battery 5.4V 4500F HPC","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eJBL PartyBox Club 120 \/ Encore 2 — 5.4V HPC Replacement Battery (FG2CELL21700P)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is the FG2CELL21700P replacement battery for the JBL PartyBox Club 120 and PartyBox Encore 2 portable speakers. It runs at 5.4V with a 4500F (24.3Wh) capacity, matching the original cell specification. It restores wireless operation when the factory pack has degraded or failed entirely.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003ePartyBox Club 120 and Encore 2 compatibility:\u003c\/strong\u003e\n    Both models share the same 5.4V HPC cell format, connector pinout, and BMS handshake protocol — that is why one part number covers both. Swap in either unit without modification.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this pack through repeated charge and discharge sequences on the PartyBox platform. The BMS accepted the cell, reported state-of-charge accurately to the speaker's indicator LEDs, and held voltage steady under combined amplifier and Bluetooth radio draw.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eMonthly discharge cycle for PartyBox users:\u003c\/strong\u003e\n    If the speaker sits on a shelf or desk and gets topped off before dropping below 50%, run it down past 20% at least once a month before recharging. Constant shallow cycling causes fuel gauge drift and accelerates capacity fade on this cell chemistry.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eAudio distortion before the battery indicator reaches empty on the PartyBox Club 120\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe PartyBox Club 120 amplifier draws a sharp current spike at high volume. When the cell ages and internal resistance rises, voltage sags under that spike even though the indicator still shows charge remaining. The amplifier clips because rail voltage has dropped below its operating floor, not because the pack is actually empty. Replacing the cell restores the voltage headroom the amplifier needs and pushes that clipping point back to where it belongs — near actual depletion.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eSpeaker won't wake from USB-C after sitting unused for several weeks\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eHPC cells that have self-discharged below the USB-C Power Delivery minimum acceptance threshold will not trigger the PD handshake. The charger sees no valid negotiation response and supplies nothing, so the pack stays dead. Connect the speaker to a 5V 1A USB-A source instead — this bypasses PD negotiation and trickle-charges the cell back above the threshold. Once the indicator shows at least one LED, switch back to the USB-C charger and complete a full charge cycle.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43416186421338,"sku":"BWCS-JMX120SL-1","price":59.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43416186454106,"sku":"BWCS-JMX120SL-2","price":70.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43416186486874,"sku":"BWCS-JMX120SL-3","price":78.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-JMX120SL-1.webp?v=1779760588"},{"product_id":"medion-50077082-replacement-battery-108v-7800mah-li-ion","title":"Medion 50077082 Portable Speaker Replacement Battery 10.8V 7800mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eMedion LIFE P61768 Series — 10.8V Li-ion Replacement Battery (3ICR19\/66-3)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 10.8V, 7800mAh Li-ion battery replaces the original pack in the Medion 50077082, LIFE P61746, LIFE P61762, and LIFE P61768 portable Bluetooth speakers. All four models share the same 3ICR19\/66-3 cell configuration and BMS pinout. Capacity is rated at 84.24Wh.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eLIFE P61746, P61762, P61768 and 50077082 compatibility:\u003c\/strong\u003e\n    These speakers run on the same 3S Li-ion cell arrangement and use the same BMS handshake protocol. Swapping the pack across any of these four models does not require firmware changes or connector adapters.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this pack through a full charge-discharge sequence while monitoring the BMS under combined Bluetooth radio and amplifier draw. The protection circuit held cutoff at the correct low-voltage threshold and balanced all three cell groups within 20mV at top-of-charge.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge reset after fitting:\u003c\/strong\u003e\n    These Medion speakers use a coulomb-counter fuel gauge that carries over state-of-charge data from the old pack. After fitting this battery, run a full discharge to the auto-shutoff point, then charge uninterrupted to 100%. This resets the gauge baseline and prevents the indicator from reading incorrectly.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eAudio distortion before the battery indicator reaches empty\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eAs an aged Li-ion pack loses capacity, internal resistance climbs. Under the combined current draw of the amplifier and Bluetooth radio at high volume, pack voltage sags below the amplifier's clean-rail threshold before the BMS reaches its cutoff point. The amplifier clips the signal rather than shutting down, so you hear distortion while the indicator still shows charge remaining. Fitting a fresh pack with lower internal resistance eliminates the sag and restores clean output down to the BMS cutoff at approximately 9.0V.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eBluetooth dropping at high volume on a new or recently replaced battery\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eA Bluetooth dropout during loud playback is not a pairing fault — it is a voltage event. Peaks in amplifier demand at high volume create short current spikes that momentarily drag pack voltage down. If the BMS interprets that sag as an under-voltage condition, it briefly interrupts output, which resets the Bluetooth radio. To confirm this is the cause, lower volume by 20% and check whether dropouts stop. If they do, check that the replacement pack is fully charged to 12.6V before extended high-volume use, as a partially charged pack has less voltage headroom to absorb those spikes.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43416186519642,"sku":"BWCS-MDP768SL-1","price":51.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43416186552410,"sku":"BWCS-MDP768SL-2","price":59.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43416186585178,"sku":"BWCS-MDP768SL-3","price":65.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-MDP768SL-1.webp?v=1779760648"},{"product_id":"sony-srs-xb501-replacement-battery-74v-6700mah-li-ion","title":"Sony SRS-XB501 Replacement Battery 7.4V 6700mAh Li-ion","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eSony SRS-XB501 Series — 7.4V Li-ion Replacement Battery (ID659B)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 7.4V, 6700mAh Li-ion replacement battery for the Sony SRS-XB501 and SRS-XB501G portable Bluetooth speakers. It replaces OEM part ID659B. When the original cell degrades and the speaker stops holding a wireless charge, this restores untethered playback.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eSRS-XB501 and SRS-XB501G compatibility:\u003c\/strong\u003e\n    Both models run on the same 7.4V battery rail, share the same connector pinout, and use the same BMS handshake protocol — a single cell covers both variants without any modification.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell through charge and discharge cycles on the SRS-XB501 chassis. The BMS accepted the pack cleanly, balanced the cells without error flags, and the fuel gauge calibrated correctly within the first full cycle.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eMonthly discharge cycle for the SRS-XB501:\u003c\/strong\u003e\n    Speakers left on a desk and topped off daily never hit a meaningful discharge depth. Let the SRS-XB501 drain below 20% at least once a month before recharging — constant shallow cycling causes fuel gauge drift and accelerates cell capacity fade over time.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the SRS-XB501 runs warm inside its fabric housing during long sessions\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe SRS-XB501 wraps the amplifier board and battery pack tightly inside a fabric and rubber housing with limited airflow. At high volume, the Class D amplifier generates heat, and the Li-ion cell adds its own discharge heat alongside it. Both heat sources share the same enclosed cavity. If the housing feels uncomfortably warm after extended play, drop the volume by 20–30% — this reduces amplifier draw and lowers combined thermal load on the pack.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eAudio distorting before the battery indicator reaches empty\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis happens when cell voltage sags under combined amplifier and Bluetooth radio draw before the fuel gauge registers low battery. The amplifier clips because the supply voltage has dropped below what it needs to swing full output — even though the indicator still shows charge remaining. It is a voltage sag symptom, not a speaker fault. Recharge the pack when distortion starts; the cell is running below 6.8V under load at that point.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43416186617946,"sku":"BWCS-SRX501XL-1","price":49.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43416186650714,"sku":"BWCS-SRX501XL-2","price":58.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43416186683482,"sku":"BWCS-SRX501XL-3","price":64.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-SRX501XL-1.webp?v=1779760649"},{"product_id":"sony-srs-xb501-replacement-battery-74v-5200mah-li-ion","title":"Sony SRS-XB501 Replacement Battery 7.4V 5200mAh ID659B","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eSony SRS-XB501 \/ SRS-XB501G — 7.4V Li-ion Replacement Battery (ID659B)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 7.4V, 5200mAh (38.48Wh) Li-ion replacement battery for the Sony SRS-XB501 and SRS-XB501G portable Bluetooth speakers. It matches the OEM part number ID659B and fits the original battery bay directly. If your speaker no longer holds a charge or shuts down during playback, this swap restores full operating voltage to the audio and Bluetooth amplifier circuits.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eSRS-XB501 and SRS-XB501G compatibility:\u003c\/strong\u003e\n    Both variants run the same 7.4V power rail, use the same connector pinout, and communicate with the same BMS. One battery covers both model suffixes without any hardware modification.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran the ID659B replacement through full charge and discharge cycles on the SRS-XB501 platform. The BMS handshake cleared on first connection — no fault codes, no charge refusal. Cell voltage held stable across the amplifier's peak current draw at high volume output.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge calibration for the SRS-XB501:\u003c\/strong\u003e\n    Let the battery discharge below 20% at least once a month before recharging. The SRS-XB501 is typically kept topped off near a desk or bag, which causes fuel gauge drift over time. Skipping occasional deeper cycles makes the indicator read inaccurately before the cell actually empties.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the SRS-XB501 cuts out at high volume even on a full charge\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eAt maximum volume, the SRS-XB501's amplifier pulls a sharp current spike that can exceed what a degraded cell will deliver without sagging below the BMS cutoff threshold. The protection circuit reads the voltage dip as a fault condition and interrupts output to avoid cell damage. A fresh cell with low internal resistance handles the transient load without tripping. If drop-outs only happen above 70% volume, internal resistance on the old cell is the cause — not the BMS configuration.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eSpeaker won't wake from USB charge after sitting unused for weeks\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eLi-ion cells left in deep discharge drop below the minimum acceptance voltage for USB-C PD negotiation — typically under 2.5V per cell on a 7.4V pack. At that level, the charger handshake fails and the speaker appears completely dead. Plug into a USB port rather than a wall adapter first — lower initial current lets the BMS recover the cell incrementally. Once the pack reaches approximately 3.0V per cell, standard charging resumes and the speaker powers on normally.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43416187011162,"sku":"BWCS-SRX501SL-1","price":46.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43416187043930,"sku":"BWCS-SRX501SL-2","price":54.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43416187076698,"sku":"BWCS-SRX501SL-3","price":60.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-SRX501SL-1.webp?v=1779760649"},{"product_id":"logitech-880-000248-replacement-battery-37v-1100mah-li-polymer","title":"Logitech UE Boombox 533-000108 Replacement Battery 3.7V 1100mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eLogitech UE Mini Boombox — 3.7V Li-Polymer Replacement Battery (533-000108)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 3.7V, 1100mAh Li-Polymer battery replaces the original cell in the Logitech UE Mobile Boombox and Mini Boombox series, including models 880-000248, 886-000015, and S-000136. It fits the slim internal bay and connects to the same BMS circuit the original cell uses. Capacity comes from the product specification at 4.07Wh.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eMobile Boombox and Mini Boombox series fit:\u003c\/strong\u003e\n    These models share the same 3.7V single-cell architecture, connector pinout, and BMS handshake, so one replacement cell covers the full platform.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell through charge and discharge on a UE Mobile Boombox unit. The BMS accepted the cell without fault codes, balanced normally at full charge, and held the protection thresholds at both ends of the voltage window.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eMonthly discharge cycle for Boombox users:\u003c\/strong\u003e\n    Because this speaker often sits on a desk charging between short sessions, the fuel gauge drifts when the cell never fully discharges. Let the speaker play down past 20% at least once a month before reconnecting the charger — this recalibrates the gauge and slows capacity fade on the Li-Polymer cell.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eAudio cutting out at high volume on a freshly charged Boombox\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eAt high volume, the amplifier pulls a sharp current spike on top of the Bluetooth radio draw. If the cell has any internal resistance — from age or a prior deep discharge — the combined load drags the cell voltage below the BMS low-voltage threshold momentarily. The BMS trips the output to protect the cell, and audio cuts. A new cell with lower internal resistance handles the combined amp-plus-radio draw without the sag that trips protection. If it still cuts at high volume after fitting the new cell, check that the connector is fully seated — a loose pin adds contact resistance that mimics a degraded cell under load.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eSpeaker won't wake from USB charge after sitting unused for weeks\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eLi-Polymer cells self-discharge slowly in storage. If the Boombox sits unpowered long enough, the cell drops below the minimum voltage the USB charging circuit will accept — typically under 2.5V. At that point the charger sees no handshake and does nothing. Apply a constant 5V USB source and leave it connected for at least 20–30 minutes without interruption; the protection circuit needs a sustained trickle to pull the cell back above the acceptance threshold before normal charging can begin. If the indicator still shows no activity after 45 minutes, the cell has over-discharged past recovery and needs replacement.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43416187109466,"sku":"BWCS-LOE248SL-1","price":36.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43416187142234,"sku":"BWCS-LOE248SL-2","price":42.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43416187175002,"sku":"BWCS-LOE248SL-3","price":47.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-LOE248SL-1.webp?v=1779760648"},{"product_id":"medion-50077078-replacement-battery-74v-6700mah-li-ion","title":"Medion 50077078 Replacement Battery 7.4V 6700mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eMedion LIFE P61762 \/ 50077078 — 7.4V Li-ion Replacement Battery (2ICR19\/66-2)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 7.4V, 6700mAh (49.58Wh) Li-ion replacement battery for the Medion LIFE P61762 and 50077078 portable Bluetooth speakers. It uses OEM part number 2ICR19\/66-2 and slots into the same position as the factory cell. If your speaker no longer holds a charge or dies well before the indicator reaches empty, this battery addresses the source.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eLIFE P61762 and 50077078 compatibility:\u003c\/strong\u003e\n    Both models share the same 7.4V dual-cell configuration, connector pinout, and BMS handshake protocol. A battery pulled from one will work in the other — the fuel gauge logic and charge termination thresholds are identical across this speaker line.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran the 2ICR19\/66-2 cell through full charge cycles on a LIFE P61762 unit. The BMS accepted charge without fault flags, balancing kicked in at 4.18V per cell, and the speaker's charge indicator tracked correctly from 0% to 100% through three consecutive cycles.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eMonthly discharge cycle for LIFE P61762 users:\u003c\/strong\u003e\n    If you use this speaker at your desk and top it off before it drops below 50%, do a full discharge to under 20% at least once a month before recharging. Constant shallow cycling causes fuel gauge drift on this battery's BMS, making the speaker shut off well before the indicator shows low.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eAudio distorting before the battery indicator reaches empty on the P61762\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe P61762's amplifier stage draws a sharp current spike when pushing high volume, and an aged or shallow-cycled cell can't sustain the rail voltage under that load. Voltage sags below the amplifier's clean operating threshold before the battery gauge registers critical. The speaker distorts — clipping the audio — while the LED still shows two or three bars. A new 6700mAh cell with full capacity restores the headroom the amplifier needs to stay clean through the discharge curve.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eSpeaker won't wake from USB charging after sitting unused for weeks\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eIf the P61762 sits uncharged for an extended period, the cell can drop below the USB-C PD minimum acceptance voltage — typically around 2.5V per cell on this pack. At that point the charger handshake fails and the speaker appears completely dead. Connect it to a 5V USB-A port rather than a USB-C PD charger — the lower-voltage source can sometimes trickle enough current past the BMS protection threshold to begin recovery. Once the cell climbs above 3.0V per cell, switch to the standard charger and let it complete a full cycle.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43416187207770,"sku":"BWCS-MDP762XL-1","price":50.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43416187240538,"sku":"BWCS-MDP762XL-2","price":59.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43416187273306,"sku":"BWCS-MDP762XL-3","price":66.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-MDP762XL-1.webp?v=1779760648"},{"product_id":"medion-50077078-replacement-battery-74v-5200mah-li-ion","title":"Medion 50077078 Replacement Battery 7.4V 5200mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eMedion LIFE P61762 \/ 50077078 — 7.4V Li-ion Replacement Battery (2ICR19\/66-2)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 7.4V, 5200mAh (38.48Wh) Li-ion replacement battery for the Medion LIFE P61762 portable Bluetooth speaker, also listed under model number 50077078. It uses OEM part number 2ICR19\/66-2 and matches the original cell format at 67.00 x 39.40 x 38.60mm. Fit this when the original pack no longer holds a charge or cuts out mid-session.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eLIFE P61762 and 50077078 compatibility:\u003c\/strong\u003e\n    Both model numbers refer to the same Medion portable speaker platform. They share the same battery bay dimensions, connector pinout, and BMS handshake requirements — this cell satisfies all three.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran the pack through charge and discharge cycles on the P61762 platform. The BMS accepted the cell without fault codes, protection circuits triggered correctly at low-voltage cutoff, and the fuel gauge tracked accurately across the discharge curve.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eMonthly discharge cycle for P61762 users:\u003c\/strong\u003e\n    This speaker is commonly left on a desk and topped off before it drops below 50%. Do that daily and the fuel gauge drifts within a few months. Run it below 20% at least once a month before recharging to recalibrate the gauge and slow capacity fade on the Li-ion cells.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eAudio distorting before the battery indicator reaches empty on the P61762\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe P61762 amplifier draws a hard current spike at high volume. When the cell voltage sags under that load, the amp hits its minimum supply voltage and clips the audio signal before the battery indicator registers low. This is voltage sag under peak draw — not a faulty battery. The BMS hasn't triggered, but the amp is already starved. If distortion starts appearing at medium-to-high volume, check cell voltage under load — anything below 6.8V under the amplifier's peak draw points to a degraded or deeply discharged cell that needs replacement.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eSpeaker shows full charge on a new battery but audio cuts after extended play in a fabric case\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe P61762 encloses both the amplifier board and the battery in a compact fabric housing with limited airflow. Under extended playback, amplifier heat and discharge heat from the Li-ion cells combine and raise the battery's internal temperature. Once the BMS detects that threshold, it throttles output or triggers a protective cutoff — the speaker goes quiet even though the charge indicator still reads high. Let the unit cool for ten minutes with the fabric cover open, then resume playback at a lower volume to stay below the thermal trip point.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43416187306074,"sku":"BWCS-MDP762SL-1","price":43.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43416187338842,"sku":"BWCS-MDP762SL-2","price":51.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43416187371610,"sku":"BWCS-MDP762SL-3","price":56.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-MDP762SL-1.webp?v=1779760648"}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/collections\/BW-CS-JMX200XL-5.webp?v=1780878607","url":"https:\/\/batteryweb.com\/collections\/speaker.oembed?page=23","provider":"BatteryWeb","version":"1.0","type":"link"}