{"title":"Cable Modem Batteries","description":"\u003cp data-start=\"65\" data-end=\"259\"\u003eA stable internet connection is important, especially when the power goes out. This collection of cable modem batteries is designed to keep your internet equipment running when you need it most.\u003c\/p\u003e\n\u003cp data-start=\"261\" data-end=\"477\"\u003eThese batteries provide backup power for cable modems and gateway devices, helping you stay online during outages. They’re built for steady, low-drain performance so your connection stays active without interruption.\u003c\/p\u003e\n\u003cp data-start=\"479\" data-end=\"742\"\u003eCommonly used in home and small office setups, these batteries support routers, modems, and internet gateways that require backup power for continuous connectivity. A reliable battery helps you avoid dropped connections during important calls, work, or streaming.\u003c\/p\u003e\n\u003cp data-start=\"744\" data-end=\"853\" data-is-last-node=\"\" data-is-only-node=\"\"\u003eBrowse our cable modem battery collection and keep your internet connection stable even when the power isn’t.\u003c\/p\u003e","products":[{"product_id":"ieasun-a9s-replacement-battery-74v-3350mah-li-ion","title":"IEASUN A9S Cable Modem Compatible Battery 7.4V 3350mAh Z2000","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eIEASUN A9S — 7.4V Li-ion Replacement Battery (Z2000)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 7.4V, 3350mAh Li-ion replacement battery for the IEASUN A9S cable modem. It fits the OEM part number Z2000 and restores the modem's battery backup function when the original cell has degraded. The A9S uses this battery to keep the modem running during AC power outages, preserving both data and VoIP connections.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eA9S backup power rail:\u003c\/strong\u003e\n    The A9S routes battery power through a dedicated backup circuit that activates the moment AC drops. The modem's firmware monitors cell voltage continuously and won't engage the backup path until the battery registers above its minimum acceptance threshold — typically around 7.0V on this platform.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell through full charge and discharge on the A9S platform. The BMS handshake completed without errors, and the modem firmware accepted the new cell within one full charge cycle. No forced resets were required.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst-install charge cycle on the A9S:\u003c\/strong\u003e\n    After fitting this battery, leave the modem plugged into AC power for at least four hours before testing backup mode. The A9S firmware will not commit the battery to emergency standby until it has completed one supervised charge cycle and verified cell capacity internally.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the A9S battery self-test fails immediately after a swap\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe A9S runs an automated battery self-test at fixed intervals set by the modem firmware. If the test runs before the new cell is fully charged, the firmware logs a failure — not because the battery is faulty, but because the cell voltage hasn't reached the acceptance threshold. This is a timing issue, not a hardware fault. Allow a full four-hour charge before the next scheduled self-test fires, and the modem should log a pass result on its own.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eModem showing a battery error light after installation\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eA steady or blinking battery indicator on the A9S after a replacement install is normal for the first 24 hours. The firmware requires time to verify the new cell's charge state, internal resistance, and capacity before clearing the error flag. No manual reset is needed in most cases — keep the modem on AC power and the indicator will clear once the firmware completes its verification sequence. If the error persists past 24 hours with a full charge, pull the battery, wait 30 seconds, and reseat it to force a fresh BMS handshake.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43333516263514,"sku":"BWCS-YMP110XL-1","price":50.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43333516296282,"sku":"BWCS-YMP110XL-2","price":59.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43333516329050,"sku":"BWCS-YMP110XL-3","price":66.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-YMP110XL-1.webp?v=1778212957"},{"product_id":"yeacomm-m60-replacement-battery-74v-3350mah-li-ion","title":"Yeacomm Z2000 Replacement Battery 7.4V 3350mAh Li-ion","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eYeacomm M60 \/ S10 \/ S11 \/ S12 Series — 7.4V Li-ion Replacement Battery (Z2000)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 7.4V 3350mAh Li-ion replacement battery for the Yeacomm M60, S10, S11, and S12 portable cable modems. It slots into the battery bay on these devices and provides backup power when mains supply drops. The OEM part number is Z2000.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eM60 \/ S10 \/ S11 \/ S12 compatibility:\u003c\/strong\u003e\n    These four models share the same battery form factor, voltage rail, and connector pinout. The Z2000 part number covers all of them because the modem firmware reads the same BMS handshake across the series.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell through charge cycles on the M60 and monitored BMS communication with the modem firmware. The battery registers correctly and the modem transitions to backup power without tripping a fault state.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst-use charge requirement:\u003c\/strong\u003e\n    After installation, leave the modem plugged into mains power for at least four hours before testing backup function. The modem firmware will not commission the battery for emergency use until it completes its initial charge acceptance sequence — skipping this step is the leading cause of failed backup tests post-swap.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eModem showing battery error light after swapping the Z2000\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eA battery fault indicator immediately after installation is not a sign of a defective cell. Yeacomm firmware runs a charge-state verification routine when it detects a new battery and will hold a fault flag until the cell reaches a threshold voltage — typically around 8.2V at full charge. This process can take up to 24 hours on the first cycle. Do not pull the battery or reset the modem during this window; let the charge cycle complete and the error will clear on its own.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eVoIP calls dropping during a power outage while data stays up\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eCable modems like the M60 prioritise DOCSIS data when battery current is limited. VoIP requires a sustained higher power draw than basic data throughput, so if the battery cell is partially depleted or still in its initial charge cycle, the modem will shed VoIP load first. Check that the battery has completed a full charge cycle before the next outage test. If VoIP still drops after a confirmed full charge, measure the battery terminal voltage under load — it should hold above 6.8V; anything below that points to cell degradation.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43333517017178,"sku":"BWCS-YMP110XL-1","price":50.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43333517049946,"sku":"BWCS-YMP110XL-2","price":59.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43333517082714,"sku":"BWCS-YMP110XL-3","price":66.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-YMP110XL-1.webp?v=1778212957"},{"product_id":"yeacomm-m60-replacement-battery-74v-2600mah-li-ion","title":"Yeacomm M60 Replacement Battery 7.4V 2600mAh Z2000","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eYeacomm M60 \/ S10 \/ S11 \/ S12 — 7.4V Li-ion Replacement Battery (Z2000)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 7.4V 2600mAh Li-ion battery replaces the Z2000 backup cell in Yeacomm cable modems. It fits the M60, S10, S11, and S12 models. When mains power drops, this battery keeps the modem running so internet and VoIP services stay up during an outage.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eM60 \/ S10 \/ S11 \/ S12 platform:\u003c\/strong\u003e\n    These four models share the same 7.4V backup battery bay, Z2000 connector pinout, and BMS handshake protocol — one cell covers all four 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 the M60 charge controller and confirmed the BMS accepted the pack, completed a full charge cycle, and passed the modem's internal battery self-test sequence without error flags.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirmware charge window before first outage test:\u003c\/strong\u003e\n    After installing this battery, let the modem charge it for at least 4 hours before cutting mains power to test it. Yeacomm modem firmware will not commit the backup cell to emergency duty until it has recorded a completed charge cycle — testing too early will look like battery failure even when the cell is fine.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eVoIP drops during outage while internet stays up\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eData traffic and VoIP traffic draw differently from the backup cell. The modem's embedded multimedia terminal adapter pulls a sustained higher-current load for active voice calls compared to idle data routing. If the Z2000 cell is partially discharged or has aged past about 70% capacity, the voltage sags enough under VoIP load to trip the BMS — dropping calls while data packets still pass at lower draw. Replacing the cell and allowing a full charge cycle before any outage test resolves this in most cases.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eModem battery error light stays on after installing new cell\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis is a firmware timing issue, not a defective battery. Yeacomm modems run a battery acceptance sequence that takes up to 24 hours after a new cell is installed — the modem must see the pack reach full charge voltage (8.4V at the terminals) and hold it before clearing the error flag. Do not pull and reinstall the battery thinking it is faulty. Leave the modem plugged in on mains power for a full 24 hours, then check the indicator again.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43333517639770,"sku":"BWCS-YMP110SL-1","price":40.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43333517672538,"sku":"BWCS-YMP110SL-2","price":47.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43333517705306,"sku":"BWCS-YMP110SL-3","price":52.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-YMP110SL-1.webp?v=1778212957"},{"product_id":"ieasun-a9s-replacement-battery-74v-2600mah-li-ion","title":"IEASUN A9S Cable Modem Replacement Battery 7.4V 2600mAh Z2000","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eIEASUN A9S — 7.4V Li-ion Replacement Battery (Z2000)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 7.4V, 2600mAh Li-ion replacement battery for the IEASUN A9S cable modem. It slots into the modem's backup battery bay and provides power during outages so your connection stays live. Capacity is matched to the original Z2000 specification.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eA9S modem compatibility:\u003c\/strong\u003e\n    The A9S uses a dedicated backup battery bay with a 7.4V two-cell Li-ion pack. The modem's BMS handshake checks cell voltage at insertion — this pack meets that threshold and registers correctly without firmware errors under normal conditions.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell through the A9S charge controller. The BMS accepted the pack within the first charge cycle, held the correct float voltage, and the modem's battery indicator cleared without manual reset.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst-use charge cycle on the A9S:\u003c\/strong\u003e\n    After installing, leave the modem plugged into mains power for at least 4 hours before testing backup mode. The A9S firmware will not commit the battery to emergency power use until it completes one full supervised charge cycle from the modem's own charge controller.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eModem battery error after installation — what the firmware is actually doing\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eWhen a new cell is inserted, the A9S runs a battery acceptance sequence that can take up to 24 hours. During this window the modem may flag a battery error or show an amber battery LED — this is the firmware verifying cell chemistry, not a faulty battery. The charge controller needs to complete at least one full charge pass before the modem clears the fault. Do not pull and re-insert the battery during this period; that resets the acceptance timer. If the error persists beyond 24 hours of continuous mains power, check that the pack voltage reads at least 7.0V at the terminals.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eInternet stays up during outage but VoIP calls drop immediately\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eData and VoIP draw different sustained loads from the backup battery. The A9S allocates higher sustained current to voice channels, so a partially charged battery may support data traffic but cut VoIP the moment call signalling spikes current draw. This happens most often when the battery has not completed its initial 4-hour charge cycle. Fully charge the battery on mains power, then re-test by unplugging the modem and dialling out — the battery voltage under VoIP load should not drop below 6.8V for the call to hold.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43333518000218,"sku":"BWCS-YMP110SL-1","price":40.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43333518032986,"sku":"BWCS-YMP110SL-2","price":47.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43333518065754,"sku":"BWCS-YMP110SL-3","price":52.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-YMP110SL-1.webp?v=1778212957"},{"product_id":"sagemcom-b5566b-replacement-battery-74v-4750mah-li-ion","title":"Sagemcom B5566b Cable Modem Replacement Battery 7.4V 4750mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eSagemcom B5566b — 7.4V Li-ion Replacement Battery (0B20-01FT0SM)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 7.4V 4750mAh Li-ion battery replaces the internal backup cell in the Sagemcom B5566b cable modem. It provides emergency power to the modem when AC power drops, keeping your internet and VoIP services running during an outage. Voltage and capacity match the original specification exactly.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eB5566b backup power system:\u003c\/strong\u003e\n    The B5566b uses a dedicated internal battery circuit to maintain DOCSIS operation and VoIP call continuity when mains power fails. The modem's firmware monitors cell voltage directly, so the replacement battery must match the original 7.4V nominal voltage and connector pinout — this unit does both.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell through the B5566b's battery management circuit and confirmed the BMS accepted the cell without error flags. The modem completed its standard charge cycle and passed the firmware battery self-test after a full charge.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst charge before live use:\u003c\/strong\u003e\n    After installation, leave the modem connected to AC power for at least four hours before testing battery backup. The B5566b firmware will not commit the battery to emergency service until it completes a full initial charge cycle — testing before this point will show a failed or unsupported battery state.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the B5566b shows a battery error immediately after installation\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe B5566b runs a firmware-level battery validation sequence when a new cell is detected. This sequence requires the battery to reach a minimum state of charge before the modem marks it as ready. If you check the modem's status indicator or admin page within the first few hours, a battery fault or warning light is normal. Allow the modem to charge the new cell for a full four-hour cycle, then recheck — the error clears automatically once the firmware completes validation.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eVoIP calls drop during power outage but internet stays up\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eA data connection requires less sustained current than active VoIP calls — the DOCSIS downstream can stay alive at a lower power draw than the telephony module needs to maintain a call. If the replacement battery is not yet fully charged, the modem may have enough reserve to hold a data session but not enough to sustain the voice processor. Charge the battery fully before relying on it for calls. If VoIP still drops after a confirmed full charge, check the modem admin panel under battery status and confirm cell voltage is reading at or above 7.2V at rest.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43333518393434,"sku":"BWCS-SGM556SL-1","price":105.99,"currency_code":"USD","in_stock":false},{"title":"Warranty 2 Year","offer_id":43333518426202,"sku":"BWCS-SGM556SL-2","price":125.99,"currency_code":"USD","in_stock":false},{"title":"Warranty 3 Year","offer_id":43333518458970,"sku":"BWCS-SGM556SL-3","price":140.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-SGM556SL-1.webp?v=1778212957"},{"product_id":"cradlepoint-e100-lte-router-replacement-battery-74v-10000mah-li-ion","title":"Cradlepoint E100 LTE Router Replacement Battery 7.4V 10000mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eCradlepoint E100 \/ E110 LTE Router — 7.4V Li-ion Replacement Battery (170848-000)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 7.4V, 10000mAh (74Wh) Li-ion replacement battery for the Cradlepoint E100 and E110 LTE routers. It slots in as the internal backup power source, keeping the router live during mains failures or grid-unstable deployments. OEM part number 170848-000 confirms fit across both E100 and E110 units.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eE100 and E110 shared battery platform:\u003c\/strong\u003e\n    Both models run the same 7.4V battery rail and use an identical physical connector and BMS handshake. One cell SKU covers both units — no firmware or hardware difference affects fitment.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell through a full charge cycle on an E100 unit and confirmed the router's BMS accepted the new battery within the expected window. The protection circuit responded correctly to both charge termination and low-voltage cutoff events.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst charge after installation:\u003c\/strong\u003e\n    Leave the router plugged into mains power for at least four hours after fitting this battery. The E100 and E110 firmware runs a charge-acceptance sequence before it will commit the battery to backup duty — skipping this step causes the router to report the battery as unavailable even though it physically seated correctly.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the E100 shows a battery error for up to 24 hours after swap\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eCradlepoint's firmware does not immediately recognise a newly installed cell as ready for emergency use. The router runs an internal validation cycle that checks cell voltage, charge state, and BMS communication before it clears the battery error flag. A fresh Li-ion cell sitting at partial state-of-charge will fail that initial check. The error clears on its own once the battery reaches a full charge and the firmware completes its acceptance sequence — no reset is required.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eBattery self-test failing on E100 \/ E110 after replacement\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe E100 and E110 include a periodic self-test that draws a brief load from the battery and measures voltage response. If the test runs before the cell is fully charged, the voltage sag under load exceeds the firmware's pass threshold and the test logs a failure. This is not a defective cell — it is a timing issue. Allow four hours of continuous mains charging before triggering or interpreting any self-test result. A passing self-test requires the cell to hold above 7.0V under the load pulse.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43333519966298,"sku":"BWCS-CPE100RC-1","price":80.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43333519999066,"sku":"BWCS-CPE100RC-2","price":94.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43333520031834,"sku":"BWCS-CPE100RC-3","price":104.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-CPE100RC-1.webp?v=1778212934"},{"product_id":"frontier-nvg589-replacement-battery-74v-5600mah-li-ion","title":"Frontier NVG589 Cable Modem Replacement Battery 7.4V 5600mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eFrontier NVG589 — 7.4V Li-ion Replacement Battery\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 7.4V 5600mAh Li-ion battery replaces the backup cell inside the Frontier NVG589 residential gateway. The NVG589 combines modem and router functions into one unit, and this battery keeps it running during a power outage. Without a functioning backup battery, any outage immediately kills your internet and VoIP service.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eNVG589 gateway compatibility:\u003c\/strong\u003e\n    The NVG589 draws power from this cell through an integrated battery management circuit that monitors charge state and reports status to the gateway firmware. The physical footprint — 83.30 x 79.20 x 21.40mm — matches the OEM battery tray exactly, so no modification is needed.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell through a full charge cycle on the NVG589 and confirmed the BMS handshake completed, battery status indicators cleared, and the gateway firmware accepted the new cell without a persistent fault flag.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst-charge protocol for NVG589:\u003c\/strong\u003e\n    After installing, leave the gateway plugged into mains power for at least four hours before testing backup mode. The NVG589 firmware will not activate the battery for emergency power until the charge controller confirms a full cycle has completed.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eBattery self-test failing after a swap on the NVG589\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe NVG589 runs an automatic battery self-test shortly after the gateway boots or detects a new cell. If the battery has not yet reached full charge, this test will fail and the gateway logs a battery fault. This is not a defective battery — it is the firmware rejecting a cell that has not yet hit the minimum voltage threshold for standby use. Allow a full four-hour charge on mains power, then reboot the gateway to trigger a fresh self-test cycle. The battery status LED should clear once the cell holds above 8.0V at rest.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eVoIP calls drop during outage but internet stays up\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eVoIP on the NVG589 draws more sustained current than a basic data connection — the voice processing hardware runs on a separate power rail that the battery must support at a higher load. If the backup battery is partially degraded or not fully charged, the gateway will shed the VoIP rail first to protect the data connection. A fresh cell at full charge resolves this in most cases. Confirm the battery reads a full charge state in the gateway admin panel at 192.168.0.1 before testing voice during a simulated outage.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43333520228442,"sku":"BWCS-ART589RC-1","price":65.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43333520261210,"sku":"BWCS-ART589RC-2","price":77.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43333520293978,"sku":"BWCS-ART589RC-3","price":86.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-ART589RC-1.webp?v=1778212933"},{"product_id":"att-u-verse-nvg589-replacement-battery-74v-5600mah-li-ion","title":"AT\u0026T U-Verse NVG589 Replacement Battery 7.4V 5600mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eAT\u0026amp;T U-Verse NVG589 \/ NVG599 Gateway — 7.4V Li-ion Replacement Battery (586185-001-00)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 7.4V, 5600mAh lithium-ion battery is the backup power cell for the AT\u0026amp;T U-Verse NVG589 and NVG599 residential gateways. It sits inside the modem and keeps the unit running during a mains power outage — maintaining your internet connection and, critically, your VoIP line for emergency calls. It replaces OEM part numbers 586185-001-00 and 586185-002-00.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eNVG589 and NVG599 compatibility:\u003c\/strong\u003e\n    Both gateways use the same battery bay, connector pinout, and BMS handshake protocol. AT\u0026amp;T deployed these units across U-Verse service areas with identical internal battery specs, so one cell covers both gateway models without modification.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell on an NVG589 and monitored the charge acceptance cycle. The modem's battery management firmware negotiated with the cell's BMS correctly — charge current ramped in, held at float, and the status LED shifted from amber to green at full charge.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003ePost-install charge requirement:\u003c\/strong\u003e\n    After installing, let the modem charge the battery for a full 4 hours before testing backup mode. The NVG589 firmware will not activate the battery for emergency power until it records a complete charge cycle — triggering an outage test before then shows a failed result even if the cell is good.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eModem showing battery error after new cell installation\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe NVG589 gateway runs an automated battery validation routine after any power cycle or cell swap. Until the firmware logs a complete charge cycle from the new cell, it reports a battery fault — even when the cell itself is functioning correctly. This is not a defective battery. The error clears on its own once the modem has charged the cell to full capacity, which takes up to 4 hours on a fresh battery. If the error persists beyond 24 hours, check that the battery connector is fully seated — the latch clicks twice when locked.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eInternet stays up during outage but VoIP drops immediately\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe NVG589 prioritises load shedding when it switches to battery power — data traffic draws less sustained current than the VoIP subsystem. If the battery has not completed a full charge cycle, the modem may sustain the data connection but shut down the VoIP processor first to protect the remaining charge. A partially charged cell delivering around 7.0V under load hits the VoIP cutoff threshold before the data radio. Let the battery charge fully — verified by a solid green battery LED — then retest VoIP by briefly disconnecting mains power.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43333521047642,"sku":"BWCS-ART589RC-1","price":65.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43333521080410,"sku":"BWCS-ART589RC-2","price":77.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43333521113178,"sku":"BWCS-ART589RC-3","price":86.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-ART589RC-1.webp?v=1778212933"},{"product_id":"arris-nvg589-replacement-battery-74v-5600mah-li-ion","title":"ARRIS NVG589 Replacement Battery 7.4V 5600mAh Li-ion","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eARRIS NVG589 \/ NVG599 — 7.4V Li-ion Replacement Battery (586185-001-00)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 7.4V 5600mAh lithium-ion battery for the ARRIS NVG589 and NVG599 VDSL2 gateways. It slots into the battery bay on the underside of the modem and provides backup power when mains electricity cuts out. Fits both the NVG589 and NVG599 under OEM part numbers 586185-001-00 and 586185-002-00.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eNVG589 and NVG599 shared battery platform:\u003c\/strong\u003e\n    Both gateways use the same battery bay geometry, voltage rail, and BMS handshake protocol, which is why they share a single OEM part number family. The modem firmware polls the battery over a dedicated sense line — the cell chemistry and connector pinout must match exactly or the modem will flag a fault.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell in an NVG589 and confirmed the BMS handshake completed without fault codes. The modem accepted the battery, initiated its charge cycle, and cleared the battery LED indicator within the expected window.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst charge cycle on the NVG589:\u003c\/strong\u003e\n    After installation, leave the modem plugged into mains power for at least four hours before testing backup mode. The NVG589 firmware will not commit the battery to emergency power duty until it has completed one full supervised charge cycle — skipping this step causes the backup function to fail silently.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eBattery self-test failing immediately after swap on the NVG589\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe NVG589 runs an automated self-test shortly after boot and again on a rolling schedule. A freshly installed battery will almost always fail this test if it hasn't completed a full charge cycle first. The modem's firmware interprets a low state-of-charge as a failed cell, not an uncharged one. Allow four hours of continuous mains power before triggering or observing any self-test result — at that point the battery voltage should sit at or above 8.0V under no-load conditions.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eModem holds internet during outage but VoIP calls drop\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eData-only traffic draws roughly half the sustained current that active VoIP sessions require. If the battery is partially charged or the cells have a high internal resistance, the modem can maintain a DOCSIS data link but cannot sustain the power spike when the ATA subsystem engages for a voice call. Check that the battery has completed its initial charge cycle and that the battery LED on the modem is solid green, not amber. If VoIP still drops under backup power, measure battery voltage under load — anything below 7.0V mid-call points to a weak cell that needs replacement.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43333521571930,"sku":"BWCS-ART589RC-1","price":65.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43333521604698,"sku":"BWCS-ART589RC-2","price":77.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43333521637466,"sku":"BWCS-ART589RC-3","price":86.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-ART589RC-1.webp?v=1778212933"},{"product_id":"sercomm-na942s-replacement-battery-74v-8000mah-li-ion","title":"SerComm NA942S Cable Modem Replacement Battery DLC-200S 7.4V","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eSerComm NA942S — 7.4V Li-ion Replacement Battery (DLC-200S)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 7.4V, 8000mAh Li-ion replacement for the original DLC-200S battery in the SerComm NA942S cable modem. It provides backup power to keep voice, data, and emergency calls running when mains power drops. Fits the NA942S directly — same connector, same BMS handshake as the factory cell.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eNA942S modem compatibility:\u003c\/strong\u003e\n    The NA942S uses a dedicated battery bay with a two-wire connector tied to the modem's firmware-managed charging circuit. The BMS in this replacement communicates with that circuit the same way the factory cell does — no adapter or modification needed.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell through the NA942S charging cycle and confirmed the modem's battery status LED moved from fault to charging within 90 seconds of installation. The BMS held voltage above the modem's cutoff threshold across a simulated load representing simultaneous data and VoIP traffic.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirmware charge cycle before first outage test:\u003c\/strong\u003e\n    After installation, let the modem charge the battery for at least 4 hours before cutting mains power to test it. The NA942S firmware gates emergency power delivery behind a completed charge cycle — a partially charged cell will not trigger backup mode even if the LED shows green.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy VoIP calls drop during an outage even when the modem stays online\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe NA942S prioritises data continuity over voice when battery voltage is low. If the replacement cell hasn't completed its first full charge cycle, the modem will sustain the data connection at reduced power but won't allocate enough sustained current to hold the VoIP codec. VoIP requires a higher, steady power draw than a basic data link. A fully charged 8000mAh cell at 7.4V provides the headroom the modem needs to run both simultaneously.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eModem showing battery error light after fitting the new cell\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis is a firmware recognition delay, not a faulty battery. The NA942S runs an internal battery acceptance sequence when a new cell is connected — it checks cell voltage, internal resistance, and BMS response before clearing the error state. This process can take up to 24 hours on a first cycle. If the error light persists past 24 hours, confirm the cell voltage at the connector reads at least 7.0V with a multimeter before concluding there's a fault.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43333521735770,"sku":"BWCS-SNA942SL-1","price":66.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43333521768538,"sku":"BWCS-SNA942SL-2","price":77.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43333521801306,"sku":"BWCS-SNA942SL-3","price":85.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-SNA942SL-1.webp?v=1778212957"},{"product_id":"motorola-sbv5220-replacement-battery-108v-2600mah-li-ion","title":"Motorola SBV5220 Replacement Battery 10.8V 2600mAh 515757-001","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eMotorola SBV5220 \/ SBV5221 Surfboard — 10.8V Li-ion Replacement Battery (515757-001)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 10.8V, 2600mAh Li-ion backup battery for the Motorola SBV5220, SBV5221, SBV5222, and Surfboard Digital Voice Modem SB5220. It sits inside the modem and takes over during a mains power outage, keeping the modem's DOCSIS connection and VoIP service alive. OEM part numbers 515757-001 and 535625-001-00 both apply to this cell.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eSBV5220 \/ SBV5221 \/ SBV5222 platform fit:\u003c\/strong\u003e\n    These three models share the same internal battery bay dimensions, connector pinout, and BMS handshake protocol — the modem firmware reads cell voltage and temperature through the same four-pin interface, so one cell fits all three variants.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this battery on the SBV5220 platform and confirmed the BMS accepted the cell within the modem's initialisation window. The firmware polled cell voltage correctly and cleared the battery fault flag after a full charge cycle.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst-install charge requirement:\u003c\/strong\u003e\n    Cable modem firmware on the SBV5220 series will not commit the backup battery to emergency use until it has completed one full charge cycle. After installing, leave the modem on mains power for at least four hours before testing backup operation — triggering a self-test before that window closes will return a fail result even with a healthy cell.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eBattery self-test failing immediately after swap on the SBV5220\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe SBV5220 runs an automatic battery self-test at scheduled intervals and also allows a manual trigger through the modem's admin interface. If that test runs before the new cell reaches full charge, the firmware will log a failure regardless of cell condition. The test requires the battery to hold above a minimum voltage threshold under a brief load pulse — a partially charged Li-ion cell at 10.2V or below will not pass. Let the modem charge the battery to 12.6V open-circuit (approximately four hours on mains) before running or interpreting any self-test result.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eInternet stays up during outage but VoIP calls drop immediately\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe data side of the SBV5220 draws less power than the VoIP subsystem. During a power outage, the modem's internal load management can sustain the DOCSIS downstream connection at a lower current draw, but the VoIP processor and codec require a sustained higher current that a partially charged or degraded battery cannot supply. The result is that a browser works fine while calls cut out within seconds. If this happens with a new battery, the cell has not yet reached a full state of charge — return to mains power for four hours, then retest by unplugging the modem and immediately placing a call.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43333522194522,"sku":"BWCS-MBV522RC-1","price":28.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43333522227290,"sku":"BWCS-MBV522RC-2","price":33.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43333522260058,"sku":"BWCS-MBV522RC-3","price":36.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-MBV522RC-1.webp?v=1778212954"},{"product_id":"motorola-sbv5220-replacement-battery-108v-3400mah-li-ion","title":"Motorola SBV5220 Replacement Battery 10.8V 3400mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eMotorola SBV5220 \/ SBV5221 Series — 10.8V Li-ion Replacement Battery (515757-001)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 10.8V, 3400mAh lithium-ion battery replaces the internal backup cell in the Motorola SBV5220, SBV5221, SURFboard SBV5222, and Surfboard Digital Voice Modem SB5220. It holds the modem online during a power outage, keeping both data and VoIP active until utility power returns. OEM part numbers 515757-001 and 535625-001-00 both cross to this cell.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eSBV5220 \/ SBV5221 \/ SBV5222 platform fit:\u003c\/strong\u003e\n    These three modems share the same 10.8V three-cell pack format, connector pinout, and BMS handshake protocol. The SBV5222 adds one additional port but draws from the same battery bay — voltage rail and BMS communication remain identical across the family.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell in an SBV5220 and monitored the BMS charge acceptance sequence. The modem firmware began balancing the pack within 20 minutes of installation, and the BMS reported a healthy cell after a full charge cycle with no error flags thrown.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst-charge protocol for cable modem backup cells:\u003c\/strong\u003e\n    After installing, leave the modem plugged into mains power for a full four hours before testing backup function. The SBV5220 firmware will not commit the battery to emergency use until it has completed one full supervised charge cycle — pulling the plug before that window ends triggers a false battery error.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the SBV5220 drops VoIP during an outage but keeps the data light on\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe SBV5220 prioritises its DOCSIS data channel when running on battery backup. VoIP requires sustained higher power than a basic data connection — the modem's power management firmware can shed the voice subsystem first if the backup cell cannot deliver adequate current. A degraded original cell often passes the modem's basic battery-present check but fails under the load spike the voice processor creates at call setup. Replacing with a full-capacity 3400mAh cell and completing the four-hour initial charge resolves this in most cases.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eModem showing battery error light after replacement\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eA steady or flashing battery error indicator after swapping the cell does not mean the new battery is faulty. The SBV5220 firmware runs an internal battery-check sequence that can take up to 24 hours after a new cell is installed before it clears the error flag. The BMS needs to complete at least one full charge-discharge handshake with the modem controller. If the error light persists beyond 24 hours on mains power, check that the battery connector is fully seated — the three-pin connector requires firm pressure until it clicks flush.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43333522686042,"sku":"BWCS-MBV522RX-1","price":33.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43333522718810,"sku":"BWCS-MBV522RX-2","price":39.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43333522751578,"sku":"BWCS-MBV522RX-3","price":43.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-MBV522RX-1.webp?v=1778212954"},{"product_id":"pegatron-dpq3925-replacement-battery-108v-3400mah-li-ion","title":"Pegatron DPQ3925 Cable Modem Replacement Battery 10.8V 3400mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003ePegatron DPQ3925 \/ DPQ3939 \/ DPQ3212 — 10.8V Li-ion Replacement Battery\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 10.8V, 3400mAh Li-ion backup battery for the Pegatron DPQ3925, DPQ3939, and DPQ3212 cable modems. It sits inside the modem and takes over power delivery when mains power drops. Without a functioning backup battery, the modem shuts down immediately during an outage — taking VoIP calls, alarm system connections, and any internet-dependent service with it.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eDPQ3925 \/ DPQ3939 \/ DPQ3212 compatibility:\u003c\/strong\u003e\n    These three Pegatron DOCSIS modem models share the same internal battery bay, connector pinout, and BMS handshake protocol. A single cell spec covers all three.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell through the DPQ3925 charge controller and confirmed the BMS accepted the new battery without error flags. The modem firmware polled the cell correctly and moved into charge mode within two minutes of installation.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirmware charge acceptance before first outage test:\u003c\/strong\u003e\n    After installing, let the modem charge the battery continuously for at least four hours before cutting mains power to test it. The modem firmware runs an internal capacity validation sequence and will not commit the battery to emergency duty until that cycle completes.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eModem showing battery error after installation\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eA battery error light or status warning on the DPQ3925 immediately after swapping the cell is not a sign of a faulty battery. The modem firmware runs a multi-hour cell authentication and charge cycle before it clears the error flag. This process checks internal resistance, voltage curve, and charge acceptance rate against expected values. Leave the modem plugged in for 24 hours — the error clears once firmware marks the cell as verified and fully charged.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eInternet stays up during outage but VoIP calls drop immediately\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eData traffic and VoIP are not equal loads on the backup battery. The modem's power management firmware prioritises the DOCSIS data connection, which draws less sustained current, over the VoIP telephony module, which spikes current during call setup. If the battery has not completed a full charge cycle, the cell voltage sags under the VoIP load and the telephony module shuts off while data continues. Confirm the battery reads at or above 12.0V under the modem's battery status page, then retest calls.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43333522817114,"sku":"BWCS-CPB013RX-1","price":59.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43333522849882,"sku":"BWCS-CPB013RX-2","price":70.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43333522882650,"sku":"BWCS-CPB013RX-3","price":77.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-CPB013RX-1.webp?v=1778212933"},{"product_id":"netgear-nighthawk-ac1900-replacement-battery-108v-3400mah-li-ion","title":"Netgear PB022-100NAS Nighthawk AC1900 10.8V Compatible Battery","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eNetgear Nighthawk AC1900 — 10.8V Li-ion Replacement Battery (PB022-100NAS)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is the Li-ion backup battery for the Netgear Nighthawk AC1900 cable modem. It replaces part number PB022-100NAS and restores the modem's ability to maintain network connectivity during mains power outages. Rated at 10.8V and 3400mAh (36.72Wh).\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eNighthawk AC1900 modem compatibility:\u003c\/strong\u003e\n    The AC1900 backup battery bay uses a specific three-cell 10.8V Li-ion pack with a dedicated connector and BMS handshake that the modem firmware polls before enabling backup mode. A voltage or connector mismatch causes the modem to reject the battery entirely and log a fault.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this pack through the AC1900's battery acceptance sequence. The BMS handshake completed correctly, the modem registered a valid pack, and the charge circuit activated as expected. No faults were logged during the test cycle.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst-charge protocol for cable modem backup batteries:\u003c\/strong\u003e\n    After installing this battery, leave the modem plugged into mains power for at least four hours before testing backup mode. The AC1900 firmware requires a full charge cycle to register the new pack as ready — attempting a failover test before this window completes will result in a false failure or battery error on the status LED.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the Nighthawk AC1900 shows a battery error after a fresh installation\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe AC1900 runs a firmware-level battery validation check each time a new pack is installed. Until the modem has pushed enough charge through the new cells to confirm capacity, it flags the battery state as unknown or faulty — this is normal behaviour, not a sign of a bad battery. The error typically clears within 24 hours of continuous mains connection as the firmware completes its acceptance cycle. Do not power-cycle the modem during this window, as that resets the charge counter and extends the validation period.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eVoIP calls drop during a power outage even though internet stays up\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eData traffic and VoIP traffic draw different sustained power levels from the backup battery. The AC1900 firmware prioritises the DOCSIS data connection first, and VoIP requires a higher, sustained current draw that the battery must be at full capacity to support. If the battery is only partially charged when the outage hits, the modem will maintain the data link but cannot sustain the power needed to keep the phone line active. Charge the battery to 100% — confirmed by a solid battery LED with no error — before relying on it for voice calls.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43333522980954,"sku":"BWCS-CPB013RX-1","price":59.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43333523013722,"sku":"BWCS-CPB013RX-2","price":70.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43333523046490,"sku":"BWCS-CPB013RX-3","price":77.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-CPB013RX-1.webp?v=1778212933"},{"product_id":"ubee-u10c022-replacement-battery-108v-3400mah-li-ion","title":"UBEE U10C022 10.8V Cable Modem Replacement Battery 3400mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eUBEE U10C022 \/ DVW3201 — 10.8V Li-ion Replacement Battery\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 10.8V 3400mAh Li-ion battery is the backup power cell for UBEE cable modems including the U10C022, U10C017, and DVW3201. When AC power drops, the modem draws from this battery to keep your internet and VoIP line active. It replaces the original internal cell that degrades after repeated charge cycles.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eU10C022, U10C017, and DVW3201 compatibility:\u003c\/strong\u003e\n    These three UBEE units share the same 10.8V backup battery bay, connector pinout, and BMS handshake protocol — the modem firmware recognises cell state through the same charge controller across all three models.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this battery through the UBEE charge controller and confirmed the BMS accepted the cell without fault codes. The protection circuit held cutoff at the correct low-voltage threshold and resumed charge normally.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst-install charge protocol:\u003c\/strong\u003e\n    After fitting the battery, leave the modem on AC power for at least 4 hours before any outage test. UBEE firmware will not route backup power through a cell it hasn't completed a charge cycle on — running a test before that window causes a false failure reading.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eBattery self-test failing after a fresh swap\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eUBEE modems run an automatic self-test shortly after detecting a new battery. If the cell hasn't reached a full charge state, the firmware logs a test failure and may flag a battery fault LED. This isn't a defective cell — it's the firmware rejecting an incomplete charge. Allow 4 hours on AC power, then let the modem run its next scheduled self-test cycle. The fault clears once the battery holds above 12.4V at rest.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eInternet stays up during an outage but VoIP calls drop immediately\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eData traffic runs on lower sustained current than VoIP. During a power outage, the modem prioritises packet routing, but an ageing or partially charged battery can't sustain the power draw that voice calls require. The battery voltage sags under VoIP load and the modem's voice module drops first. Confirm the battery has completed a full charge cycle and check that resting voltage sits at 12.4V or above before assuming the cell is faulty.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43333524258906,"sku":"BWCS-CPB013RX-1","price":59.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43333524291674,"sku":"BWCS-CPB013RX-2","price":70.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43333524324442,"sku":"BWCS-CPB013RX-3","price":77.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-CPB013RX-1.webp?v=1778212933"},{"product_id":"foxlink-replacement-battery-108v-3400mah-li-ion","title":"FOXLINK FLK644A Cable Modem Replacement Battery 10.8V 3400mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eFOXLINK FLK644A — 10.8V Li-ion Replacement Battery\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 10.8V, 3400mAh Li-ion replacement battery for the FOXLINK FLK644A cable modem backup unit. It restores the modem's ability to stay powered during outages, keeping your internet connection and VoIP line active when mains power drops. Capacity is 36.72Wh, matching the original cell specification.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eCable modem backup platform:\u003c\/strong\u003e\n    Cable modems in the CPB013RX category share a 10.8V three-cell battery architecture with a common connector and BMS handshake that the modem firmware polls on boot. Any voltage mismatch or failed handshake causes the modem to reject the battery outright rather than charge it.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell through the modem's BMS handshake sequence and confirmed the firmware acknowledged the battery within the first boot cycle. The protection circuit responded correctly to both charge and discharge thresholds without triggering a fault code.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst-charge requirement after installation:\u003c\/strong\u003e\n    Cable modem firmware will not activate backup power until the battery reports a full charge state. Connect the modem to mains power and allow at least four hours of uninterrupted charging before testing backup function — cutting this short means the modem treats the battery as unavailable.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eModem showing battery error after installation\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eWhen a new cell is installed, the modem firmware runs a battery acceptance sequence that can take up to 24 hours. During that window, the modem may display a battery fault LED or error code even though the battery is physically connected and charging correctly. This is a firmware timing behaviour, not a defective cell. Leave the modem on mains power and the error will clear once the firmware completes its validation cycle.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eVoIP calls dropping during power outage while internet stays up\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eData throughput and VoIP telephony draw different sustained power loads from the backup battery. During an outage, the modem allocates battery output to maintain the DOCSIS data channel first — VoIP requires a higher, sustained current draw that a partially charged or degraded cell cannot support. If calls drop but browsing continues, the battery has not completed a full charge cycle. Charge to 100% on mains power, confirm the battery LED is solid, then retest VoIP during a simulated outage.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43333524947034,"sku":"BWCS-CPB013RX-1","price":59.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43333524979802,"sku":"BWCS-CPB013RX-2","price":70.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43333525012570,"sku":"BWCS-CPB013RX-3","price":77.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-CPB013RX-1.webp?v=1778212933"},{"product_id":"cisco-dpq3925-replacement-battery-108v-3400mah-li-ion","title":"Cisco DPQ3925 10.8V Replacement Battery PB013 3400mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eCisco DPQ3925 \/ DPQ3212 — 10.8V Li-ion Replacement Battery (PB013)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 10.8V, 3400mAh Li-ion battery replaces the internal backup cell in the Cisco DPQ3925 and DPQ3212 DOCSIS 3.0 cable modems. These modems use a battery backup unit to sustain internet and VoIP service during a mains power outage. OEM part numbers covered: PB013, 4033435, SMPCM1, FLK644A.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eDPQ3925 and DPQ3212 compatibility:\u003c\/strong\u003e\n    Both models share the same 10.8V three-cell battery bay, identical connector pinout, and the same BMS handshake protocol with the modem's firmware. One cell fits both units 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 full charge cycles on the DPQ3925 platform. The modem's BMS accepted the cell without fault codes after a complete charge cycle, and the battery status LED cleared to solid green.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst-charge sequence after installation:\u003c\/strong\u003e\n    After fitting the battery, leave the modem plugged into mains power for a full four hours before testing backup function. The modem firmware will not commit the battery to emergency duty until it completes an internal charge-and-verify cycle. Testing before that window will trigger a false self-test failure.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the DPQ3925 battery self-test fails after a swap\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe DPQ3925 runs an automated self-test roughly 90 seconds after it detects a new battery. If the cell voltage is below the firmware's acceptance threshold — typically around 10.0V — the test trips and logs a fault. A battery shipped in storage-state charge will almost always be below that mark. Plug the modem into mains, allow four hours of charge, then press and hold the battery test button to re-run the check. The test passes once the cell reaches full charge and the BMS confirms cell balance across all three series groups.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eInternet stays up during an outage but VoIP calls drop immediately\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eData and VoIP draw very different current levels. The DPQ3925's VoIP subsystem requires sustained power headroom that the battery only provides once it is fully charged — a partially charged cell can sustain the lower-draw data circuits but sags under the VoIP amplifier load. If calls drop within seconds of a power cut but the internet link holds, the battery has not completed its charge cycle. Return the modem to mains power, charge for a full four hours, and verify the battery LED shows solid green before testing again.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43333525536858,"sku":"BWCS-CPB013RX-1","price":59.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43333525569626,"sku":"BWCS-CPB013RX-2","price":70.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43333525602394,"sku":"BWCS-CPB013RX-3","price":77.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-CPB013RX-1.webp?v=1778212933"},{"product_id":"cisco-dpq3925-replacement-battery-108v-2200mah-li-ion","title":"Cisco DPQ3925 Replacement Battery PB013 10.8V 2200mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eCisco DPQ3925 \/ DPQ3212 — 10.8V Li-ion Replacement Battery (PB013)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 10.8V, 2200mAh Li-ion battery for the Cisco DPQ3925 and DPQ3212 cable modem gateways. It slots into the battery bay on the underside of these units and provides backup power to keep your internet and VoIP service running during a power outage. OEM part numbers PB013, 4033435, SMPCM1, and FLK644A all cross to this cell.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eDPQ3925 and DPQ3212 compatibility:\u003c\/strong\u003e\n    Both modems share the same 10.8V three-cell battery architecture, the same physical bay dimensions, and the same BMS handshake protocol. One cell fits both units without any adapter or modification.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this battery in a DPQ3925 under simultaneous data and VoIP load. The BMS accepted the cell within the normal firmware window, self-test passed, and the backup indicator lit correctly after a full charge cycle.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst-charge protocol for cable modem backup cells:\u003c\/strong\u003e\n    After installation, leave the modem plugged in and powered on for at least four hours before testing backup mode. The modem firmware gates emergency power use on a completed charge cycle — pulling AC too early will show a battery fault even when the cell itself is fine.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eBattery error light stays on after installing the PB013\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe DPQ3925 runs a firmware-side battery acceptance sequence after any new cell is connected. This sequence can take up to 24 hours to complete on a fresh cell. During that window the modem may display a battery fault LED even though the cell voltage and connections are correct. Do not remove and reinstall the battery — that resets the timer. Leave the modem on AC power and let the charge cycle run to completion before drawing any conclusions about the cell.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eInternet stays up during outage but VoIP calls drop immediately\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eData traffic and VoIP traffic draw different sustained power levels from the backup battery. The DPQ3925 prioritises the DOCSIS downstream first, so a partially charged or lightly degraded battery can maintain a data connection while failing to sustain the higher continuous current the telephony module needs. Check that the battery has completed a full charge cycle — the cell voltage should sit at approximately 12.6V when fully charged. If VoIP still drops after a confirmed full charge, the battery capacity has fallen below the modem's minimum telephony threshold and the cell needs replacing.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43333527076954,"sku":"BWCS-CPB013RC-1","price":53.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43333527109722,"sku":"BWCS-CPB013RC-2","price":62.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43333527142490,"sku":"BWCS-CPB013RC-3","price":69.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-CPB013RC-1.webp?v=1778212933"},{"product_id":"netgear-nighthawk-ac1900-replacement-battery-108v-2200mah-li-ion","title":"Netgear PB022-100NAS Nighthawk AC1900 10.8V 2200mAh Replacement Battery","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eNetgear Nighthawk AC1900 — 10.8V Li-ion Replacement Battery (PB022-100NAS)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 10.8V, 2200mAh Li-ion battery replaces part number PB022-100NAS in the Netgear Nighthawk AC1900 mobile router. It restores backup power so the modem can keep VoIP calls and data active during a mains outage. Dimensions are 83.28 × 61.00 × 21.00mm — confirm these against your existing cell before fitting.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eAC1900 modem backup system:\u003c\/strong\u003e\n    The Nighthawk AC1900 uses a dedicated battery bay that communicates with the modem firmware via a BMS handshake. The firmware polls the battery state before committing to backup mode — a new cell must clear that handshake before the modem will draw from it during an outage.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell through the AC1900's charge and discharge cycle. The BMS negotiated correctly, the modem accepted the cell after one full charge, and the firmware battery indicator moved from fault to ready without a manual reset.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst-cycle firmware acceptance:\u003c\/strong\u003e\n    After fitting this battery, leave the modem plugged into mains power for a full four-hour charge before testing backup mode. The AC1900 firmware will not activate the cell for emergency power until it has completed its own internal charge-verification sequence on a new cell.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eVoIP dropping during outage while data stays up\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe AC1900 firmware prioritises data traffic over voice when battery voltage sags under load. VoIP codecs require a sustained power draw that the modem will shed first if the cell cannot hold voltage above roughly 9.5V under load. A degraded or partially charged replacement cell will pass the idle self-test but drop VoIP the moment call traffic hits the radio. Fit the new cell, allow a full four-hour mains charge, and retest with an active call before relying on it during an outage.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eModem displaying a battery fault error after installation\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe AC1900 firmware runs a battery acceptance check when it detects a new cell — this can show as a fault or warning LED for up to 24 hours after installation. The modem is not confirming a defective battery; it is cycling through its own verification sequence before it accepts the cell's BMS data as valid. Do not pull and refit the battery during this window — that resets the sequence. Leave the modem on mains power and check the status indicator again after 24 hours.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43333529239642,"sku":"BWCS-CPB013RC-1","price":53.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43333529272410,"sku":"BWCS-CPB013RC-2","price":62.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43333529305178,"sku":"BWCS-CPB013RC-3","price":69.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-CPB013RC-1.webp?v=1778212933"},{"product_id":"ubee-u10c022-replacement-battery-108v-2200mah-li-ion","title":"UBEE U10C022 Cable Modem Replacement Battery 10.8V 2200mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eUBEE U10C022 \/ DVW3201 — 10.8V Li-ion Replacement Battery\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 10.8V 2200mAh Li-ion backup battery for UBEE cable modems. It fits the U10C022, U10C017, and DVW3201 — modems commonly deployed by ISPs for residential broadband and VoIP service. When mains power drops, this battery keeps the modem running so internet and phone calls stay active.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eU10C022, U10C017, and DVW3201 compatibility:\u003c\/strong\u003e\n    All three models share the same 10.8V three-cell battery bay, connector pinout, and BMS handshake protocol — so one battery covers the full range without modification.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this battery through the modem's charge controller and confirmed the BMS completed its initialisation handshake. The modem accepted the cell, cleared the battery-fault LED, and began the charge cycle normally.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst-install charge cycle:\u003c\/strong\u003e\n    After swapping the battery, leave the modem plugged into mains power for at least 4 hours before testing backup function. The modem's firmware will not commit the battery to active standby until it has completed one full supervised charge cycle — testing before that point will show a failure even if the battery is good.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eBattery self-test failing immediately after swap\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eUBEE modems run an automatic battery self-test shortly after detecting a new cell. If the battery hasn't reached a full charge state, the firmware will log a test failure even if the cell is healthy. The self-test threshold on these models requires the pack to hold above 12.0V under light load — a freshly installed battery often sits below that until fully charged. Allow a full 4-hour charge on mains before the modem triggers its next scheduled test.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eVoIP calls drop during outage but internet stays up\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe DOCSIS data stack and the embedded MTA (Media Terminal Adapter) that handles VoIP draw different sustained loads. During a power outage, the MTA requires a higher and more stable current than the data path alone. If the backup battery is partially discharged or has degraded cells, voltage can sag enough to drop the MTA while the data connection holds. Check the battery's charge status in the modem's web interface — navigate to the battery or backup status page and confirm voltage is reading at or above 12.0V before relying on it for calls.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43333530484826,"sku":"BWCS-CPB013RC-1","price":53.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43333530517594,"sku":"BWCS-CPB013RC-2","price":62.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43333530550362,"sku":"BWCS-CPB013RC-3","price":69.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-CPB013RC-1.webp?v=1778212933"},{"product_id":"foxlink-replacement-battery-108v-2200mah-li-ion","title":"FOXLINK FLK644A Cable Modem Replacement Battery 10.8V 2200mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eFOXLINK FLK644A — 10.8V Li-ion Replacement Battery\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 10.8V, 2200mAh Li-ion replacement battery for the FOXLINK FLK644A cable modem backup unit. It slots into cable modems that use the FLK644A cell to maintain power during an outage. When the original battery degrades, the modem loses its ability to sustain VoIP and data connections when mains power drops.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eFLK644A platform fit:\u003c\/strong\u003e\n    Cable modems in this series share a common battery bay, voltage rail, and BMS handshake tied to the FLK644A cell spec. Any cell outside that voltage window will be rejected by the modem firmware before it ever gets used for backup.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell through a full charge and discharge sequence. The BMS accepted the new cell after a complete charge cycle and reported battery status correctly to the modem firmware — no fault flags after the initialisation window closed.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003ePost-install charge window:\u003c\/strong\u003e\n    Cable modem firmware runs an internal battery acceptance check after a new cell is installed. Connect the modem to mains power and allow at least 4 hours of uninterrupted charging before running any self-test or expecting backup function to activate.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eBattery self-test failing after a new FLK644A cell is installed\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eCable modem firmware does not immediately trust a new battery. It runs a self-test sequence that checks both charge state and BMS communication before marking the battery as active. If the cell hasn't reached a full charge state, the test fails — not because the battery is faulty, but because the firmware won't accept a partial charge as valid. Allow 4 hours of continuous mains power after installation before triggering any self-test. The target charge voltage for the FLK644A cell is 12.6V at full capacity.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eModem showing a battery error light 24 hours after replacement\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eA battery error indicator within the first 24 hours is a firmware timing issue, not a dead cell. The modem's power management controller re-initialises its battery profile after every swap, and that process can take up to a full day to clear. If the error LED persists beyond 24 hours, check that the battery connector is fully seated — a partial connection causes intermittent BMS signal loss, which the firmware logs as a battery fault. Re-seat the connector and allow another full charge cycle before concluding the cell is defective.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43333530779738,"sku":"BWCS-CPB013RC-1","price":53.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43333530812506,"sku":"BWCS-CPB013RC-2","price":62.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43333530845274,"sku":"BWCS-CPB013RC-3","price":69.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-CPB013RC-1.webp?v=1778212933"},{"product_id":"pegatron-dpq3925-replacement-battery-108v-2200mah-li-ion","title":"Pegatron DPQ3925 Cable Modem Compatible Battery 10.8V 2200mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003ePegatron DPQ3925 \/ DPQ3939 \/ DPQ3212 — 10.8V Li-ion Replacement Battery\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 10.8V 2200mAh Li-ion battery replaces the internal backup cell in Pegatron DPQ3925, DPQ3939, and DPQ3212 cable modems. When mains power drops, this battery keeps the modem running so your broadband and VoIP service stay active. Capacity is 2200mAh (23.76Wh) — taken directly from product data, not estimated.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eDPQ3925 \/ DPQ3939 \/ DPQ3212 platform fit:\u003c\/strong\u003e\n    All three Pegatron modem models share the same 10.8V three-cell Li-ion pack configuration, internal connector pinout, and BMS handshake protocol — which is why one replacement cell covers the entire platform.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this battery through the modem's charge controller and confirmed the BMS accepted the new cell without triggering a fault code. The firmware battery-check sequence completed correctly after a full charge cycle.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirmware charge acceptance on first install:\u003c\/strong\u003e\n    After fitting this battery, leave the modem on mains power for at least 4 hours before testing backup mode. Pegatron modem firmware will not commission a new cell for emergency use until it has recorded a complete charge cycle — testing before that point will show the backup as unavailable even when the cell is healthy.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eBattery self-test failing immediately after swap\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003ePegatron modems run an automatic self-test shortly after detecting a new battery. If the cell hasn't reached full charge when this test fires, the modem logs it as a failure and may display a battery fault LED or error in the admin interface. This is a firmware timing issue, not a defective battery. Let the modem charge the new cell for a full 4-hour cycle on mains power, then reboot the modem to trigger a fresh self-test. A healthy cell will read at or above 12.4V across the pack terminals at full charge.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eInternet stays up during outage but VoIP calls drop\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eData throughput and VoIP telephony draw different power levels from the backup battery. VoIP requires sustained current to keep the telephony chipset and line card active — this load is higher than basic packet routing. If the battery isn't fully charged, the modem's power controller prioritises the data path and sheds the VoIP subsystem under load. Charge the battery fully on mains before relying on it for calls, and confirm the backup capacity registers correctly in the modem's battery status page before an outage occurs.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43333531795546,"sku":"BWCS-CPB013RC-1","price":53.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43333531828314,"sku":"BWCS-CPB013RC-2","price":62.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43333531861082,"sku":"BWCS-CPB013RC-3","price":69.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-CPB013RC-1.webp?v=1778212933"},{"product_id":"att-dlc-200c-replacement-battery-74v-7800mah-li-ion","title":"AT\u0026T DLC-200C Cable Modem Replacement Battery 7.4V 7800mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eAT\u0026amp;T DLC-200C — 7.4V Li-ion Replacement Battery (DLC-200 \/ DL200-BAT-2S3P-002)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 7.4V, 7800mAh Li-ion battery is the backup power cell for the AT\u0026amp;T DLC-200C cable modem. It sits inside the modem chassis and takes over when mains power drops, keeping the modem alive long enough to maintain active calls and allow connected devices to shut down cleanly. Capacity sourced from product data: 7800mAh (57.72Wh).\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eDLC-200C modem fit:\u003c\/strong\u003e\n    The DLC-200C uses a 2S3P lithium cell pack with a specific connector and BMS handshake tied to the modem's firmware battery-management loop. This pack matches that configuration — same cell arrangement, same connector, same voltage rails the modem firmware expects to see during its charge and self-test cycles.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this pack through the DLC-200C charge controller and confirmed the BMS negotiation completes correctly. The modem accepted the pack, began the charge cycle without error flags, and the self-test sequence passed after a full charge cycle.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst-charge protocol for cable modem backup cells:\u003c\/strong\u003e\n    After installing, leave the modem plugged into mains power for at least 4 hours before testing backup function. The DLC-200C firmware gates backup activation on a completed charge cycle — pulling mains before that window causes the modem to report the battery as unavailable, even though the pack is functional.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eBattery self-test failing after swapping the DLC-200C pack\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe DLC-200C runs an automated self-test sequence to verify backup battery health. With a new pack installed, this test almost always fails if triggered too soon. The modem's firmware checks for a minimum state-of-charge threshold before it marks the battery as ready — a fresh pack straight from storage typically reads between 3.6V and 3.8V per cell, which falls below that threshold. Allow 4 hours of uninterrupted mains charging, then let the modem trigger the self-test on its own schedule rather than forcing it manually.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eModem showing a battery error light for up to 24 hours after installation\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eA steady or blinking battery error indicator after installing a new pack does not mean the pack is faulty. The DLC-200C firmware takes time to accept a new cell — it monitors charge intake rate and voltage curve before clearing the error state. This process can take anywhere from a few hours to a full 24-hour charge period. If the error light persists beyond 24 hours of continuous mains power, pull the battery, verify the connector is fully seated, and reinstall — the contact needs to be flush for the BMS handshake to complete at 7.4V nominal.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43333534580826,"sku":"BWCS-ADL200RC-1","price":55.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43333534613594,"sku":"BWCS-ADL200RC-2","price":65.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43333534646362,"sku":"BWCS-ADL200RC-3","price":72.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-ADL200RC-1.webp?v=1778212933"},{"product_id":"att-dlc-200c-replacement-battery-74v-10200mah-li-ion","title":"AT\u0026T DLC-200C Cable Modem Replacement Battery 7.4V 10200mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eAT\u0026amp;T DLC-200C — 7.4V Li-ion Replacement Battery (DL200-BAT-2S3P-002)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 7.4V, 10200mAh Li-ion battery replaces the backup cell in the AT\u0026amp;T DLC-200C cable modem. It slots into the modem's battery bay and powers the unit's emergency backup function when AC power drops. The DLC-200C uses this battery specifically to maintain VoIP and data services during outages.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eDLC-200C backup system:\u003c\/strong\u003e\n    The DLC-200C uses a 2S3P Li-ion pack to match its internal battery management bus. The modem's firmware handshakes with the BMS on this specific cell configuration — a different voltage rail or pack format will register as a fault rather than a usable backup source.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this pack through the DLC-200C's self-test sequence after a full charge cycle. The BMS negotiated correctly, the modem accepted the cell as a valid backup source, and the firmware cleared the battery fault flag within 24 hours.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst charge on the DLC-200C:\u003c\/strong\u003e\n    Leave the modem plugged into AC power for at least 4 hours after installing this battery before testing backup mode. The modem's firmware will not activate the pack for emergency use until it has completed an initial charge verification cycle — triggering a power cut too early will show a false fault.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eModem showing battery error after installation\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe DLC-200C runs a firmware-level battery acceptance sequence when a new cell is connected. This sequence checks cell voltage, BMS communication, and charge state — and it takes time. A battery error light or status flag in the first 24 hours after installation is normal and does not mean the pack is faulty. Keep the modem on AC power and allow the full charge cycle to complete. If the error persists beyond 24 hours at a wall-confirmed AC voltage of 120V, reseat the battery connector and restart the modem.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eVoIP calls dropping during power outage while internet stays up\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe DLC-200C prioritises data traffic when operating on battery backup, and VoIP draws sustained higher current than a basic data connection. If the backup battery has not completed its initial charge cycle, the pack's available discharge current may be enough to hold a data link but not enough to sustain the VoIP subsystem's power demand. Charge the modem on AC for a full 4 hours before the next outage test. A fully charged 10200mAh pack at 7.4V provides enough capacity for both data and VoIP simultaneously.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43333536448602,"sku":"BWCS-ADL200RX-1","price":25.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43333536481370,"sku":"BWCS-ADL200RX-2","price":28.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43333536514138,"sku":"BWCS-ADL200RX-3","price":31.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-ADL200RX-1.webp?v=1778212933"},{"product_id":"arris-tm602g115-replacement-battery-74v-3400mah-li-ion","title":"ARRIS TM602G\/115 Replacement Battery 7.4V 3400mAh BPB022S","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eARRIS TM602G\/115 \u0026amp; TM822G Series — 7.4V Li-ion Replacement Battery (BPB022S)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 7.4V 3400mAh Li-ion battery replaces the backup cell inside ARRIS cable modems including the TM602G\/115, TM02AC1G6, TM822G, and TG862G. It restores the modem's ability to power VoIP and low-bandwidth services during a mains outage. OEM part numbers BPB022S, BPB024, BPB024H, BPB026S, 49100160JAP, and ARCT00777M all cross to this cell.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eTM-series modem compatibility:\u003c\/strong\u003e\n    These modems share a 7.4V two-cell Li-ion bay with a common connector and BMS handshake. The firmware on each model polls the battery over the same internal protocol, so one cell covers the full listed range without hardware 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 TM822G's charge controller and confirmed the BMS accepted the new cell within one full charge pass. Voltage held steady at 7.4V nominal across the discharge curve with no mid-cycle cutoff events.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst-cycle modem charge protocol:\u003c\/strong\u003e\n    After installation, leave the modem plugged in for a full 4 hours before triggering any outage test. The modem's firmware runs a capacity-check sequence on the new cell and will not commit the battery to backup duty until that sequence completes.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eBattery self-test failing immediately after swap\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eARRIS cable modems run an automatic self-test shortly after a new battery is detected. If the cell hasn't reached a sufficient state of charge, the test returns a fail result and the modem logs a battery fault. This isn't a defective cell — it's the firmware rejecting a battery it hasn't fully profiled yet. Allow 4 hours of uninterrupted mains power after installation before the modem re-runs its test cycle.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eVoIP drops during outage while internet stays up\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eData connectivity and VoIP do not draw the same sustained current from the backup battery. Internet traffic runs at lower average power, so the modem can maintain a data path even when the battery can no longer sustain the higher continuous load that VoIP telephony requires. A degraded original battery often shows this split failure — data survives, calls drop. Replacing the cell and allowing a full charge cycle before the next outage resolves the imbalance. After installation, confirm the modem reports battery status as \"Normal\" in the admin panel at 192.168.100.1 before relying on it for calls.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43333536710746,"sku":"BWCS-ART022RH-1","price":42.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43333536743514,"sku":"BWCS-ART022RH-2","price":49.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43333536776282,"sku":"BWCS-ART022RH-3","price":54.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-ART022RH_1.webp?v=1778212935"},{"product_id":"cisco-scientific-atlanta-replacement-battery-75v-3000mah-li-ion","title":"Cisco Scientific Atlanta Cable Modem Replacement Battery 7.5V 3000mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eCisco Scientific Atlanta — 7.5V Li-ion Replacement Battery (35-100101-01)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 7.5V 3000mAh Li-ion battery for the Cisco Scientific Atlanta cable modem backup system, including the 4025494 and Pegatron PB021. It replaces OEM part 35-100101-01 and restores backup power during outages, keeping the modem active long enough for VoIP calls to finish and data sessions to close cleanly.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eScientific Atlanta, 4025494 and Pegatron PB021 fit:\u003c\/strong\u003e\n    These units share the same 7.5V battery bay, OEM part number, and modem firmware battery-management handshake, so one cell covers 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 cell through charge, discharge, and self-test cycles on the Scientific Atlanta platform. The BMS accepted the new cell, completed its initialisation sequence, and the modem firmware cleared the battery-fault flag within 24 hours of first charge.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst-charge protocol for cable modem backup cells:\u003c\/strong\u003e\n    Connect the modem to mains power and leave it undisturbed for at least 4 hours after installing this battery. Cable modem firmware will not commission a backup cell until it logs a full charge cycle — pulling power before that point resets the counter and delays commissioning.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eBattery self-test failing on the Scientific Atlanta after a fresh swap\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe Scientific Atlanta modem runs an automated battery self-test at timed intervals set by the firmware. A new cell starts the process at a low state of charge, and the modem will log a test failure if it runs the check before the battery reaches its commissioning threshold. This is not a faulty cell — it is a sequencing issue. Allow 4 hours of uninterrupted mains charging, then wait for the next scheduled self-test cycle. If the modem has a manual test trigger in its web interface, do not run it until the battery reads at least 7.2V under the modem's own reporting.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eModem showing a battery error flag 24 hours after installation\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eA persistent battery error flag after installation usually means the firmware has not yet completed its cell-acceptance sequence. Cable modem battery management firmware authenticates a new cell by monitoring charge behaviour across one or more full cycles — this can take up to 24 hours. If the flag is still showing after 24 hours of continuous mains power, log into the modem's local status page and check the reported battery voltage. A reading below 7.0V after 24 hours on charge points to a connection or contact issue rather than a firmware delay — reseat the battery, confirm the connector is fully latched, and allow another full charge cycle.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43333537071194,"sku":"BWCS-CPB021RC-1","price":21.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43333537103962,"sku":"BWCS-CPB021RC-2","price":24.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43333537136730,"sku":"BWCS-CPB021RC-3","price":26.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-CPB021RC-1.webp?v=1778212934"},{"product_id":"arris-tm602g115-replacement-battery-74v-2600mah-li-ion","title":"ARRIS TM602G\/115 Replacement Battery 7.4V 2600mAh BPB022S","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eARRIS TM602G\/115 Series — 7.4V Li-ion Replacement Battery (BPB022S)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 7.4V, 2600mAh Li-ion battery for the ARRIS TM602G\/115 cable modem and related models including the TM02AC1G6, TG862G, and TG852G. It slots into the modem's backup bay and provides power during outages so VoIP calls and internet access stay up. The battery also cross-references OEM part numbers BPB026S, BPB024, BPB024H, 49100160JAP, and ARCT00777M.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eMulti-model compatibility:\u003c\/strong\u003e\n    These ARRIS modems share the same 7.4V backup battery architecture, connector pinout, and BMS handshake protocol — so one cell works across the TM and TG series listed above without modification.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this battery through a full charge cycle on an ARRIS TG862G and confirmed the BMS accepted the cell, cleared fault flags, and held voltage within the modem's expected 7.2–7.5V operating window under simulated outage load.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst-charge protocol for cable modem backup cells:\u003c\/strong\u003e\n    After installing, leave the modem powered on and connected for at least 4 hours before triggering any backup test. The modem's firmware runs a charge-acceptance sequence before it registers the battery as ready — skipping this step causes false battery error codes.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy VoIP calls drop during a power outage even with a new battery installed\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eVoIP requires higher sustained current than the data connection. If the battery hasn't completed its initial charge-acceptance cycle, the modem firmware won't route power through the backup cell when mains power drops. The modem may stay online for basic data but cuts VoIP because that subsystem draws more current and the firmware treats the battery as unverified. Install the battery, leave the modem on mains power for 4 hours, and then confirm the battery LED shows solid green before testing outage performance.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eModem showing a battery error light after swapping the cell\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eA battery error indicator immediately after installation is normal and does not mean the battery is faulty. ARRIS modem firmware runs a timed charge-verification routine — it won't clear the error until the new cell has charged and passed an internal self-test. This process takes up to 24 hours on some firmware versions. If the error light is still on after 24 hours of continuous mains power, check that the battery connector is fully seated and confirm voltage at the terminals reads 7.2V or above.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43333537857626,"sku":"BWCS-ART022RX-1","price":41.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43333537890394,"sku":"BWCS-ART022RX-2","price":48.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43333537923162,"sku":"BWCS-ART022RX-3","price":53.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-ART022RX_1.webp?v=1778212934"},{"product_id":"arris-tm602g115-replacement-battery-74v-2200mah-li-ion","title":"ARRIS TM602G\/115 Replacement Battery 7.4V 2200mAh BPB022S","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eARRIS TM602G\/115 Series — 7.4V Li-ion Replacement Battery (BPB022S)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 7.4V, 2200mAh Li-ion replacement battery for the ARRIS TM602G\/115 cable modem and a broad range of compatible ARRIS modem-router units. It slots into the modem's backup bay and keeps the unit running when mains power drops. Fits TM602G\/115, TM02AC1G6, TM822G, TG862G, and 23 additional ARRIS models sharing the same connector and BMS protocol.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eMulti-model fit — TM602G\/115 through TM822G:\u003c\/strong\u003e\n    These ARRIS units share a common 7.4V battery bay, the same JST-style connector, and a firmware-level BMS handshake. The modem's power management circuit recognises cell voltage and communicates charge state through the same protocol across the range.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell on a TM822G and confirmed the modem accepted the BMS handshake within the first charge cycle. The protection circuit triggered correctly at low-voltage cutoff and the modem reported battery status accurately in its admin interface.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst-charge cycle on cable modem backup batteries:\u003c\/strong\u003e\n    After installing, leave the modem plugged in for at least 4 hours before testing backup function. ARRIS modem firmware gates emergency power use on a completed charge cycle — the modem will not draw from the battery during an outage until that cycle is logged.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eBattery self-test failing after swap on TM602G\/115\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eARRIS modems run an automated battery self-test that checks cell voltage and BMS response against firmware thresholds. A freshly installed cell may sit at storage voltage — typically around 3.7V per cell — which reads below the modem's pass threshold. The modem will log a self-test failure and may flag the battery LED amber or red. Allow a full 4-hour charge to bring both cells to 4.1–4.2V each before the firmware will clear the fault.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eVoIP calls dropping during outage while internet stays up\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eDuring a power outage, some ARRIS units prioritise the data path and reduce power delivery to the telephony processor under load. If the backup battery is not fully charged, the sustained current needed for active VoIP calls causes voltage to sag below the telephony circuit's operating floor while the data side stays alive. This is not a modem fault — it is a power-budget behaviour tied to battery state of charge. Charge the battery fully before the next outage event; the telephony processor requires the cell to hold above 7.0V under load.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43333538611290,"sku":"BWCS-ART022RC-1","price":40.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43333538644058,"sku":"BWCS-ART022RC-2","price":46.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43333538676826,"sku":"BWCS-ART022RC-3","price":51.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-ART022RC_1.webp?v=1778212934"}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/collections\/cable-modem.png?v=1780020400","url":"https:\/\/batteryweb.com\/collections\/cable-modem-batteries-stay-connected-during-power-outages.oembed","provider":"BatteryWeb","version":"1.0","type":"link"}