{"title":"Solar Batteries","description":"\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eYou put in the work setting up your solar system — the panels, the wiring, the whole setup — and the battery is what makes it actually useful. Without a solid battery holding onto that energy, everything your panels collect during the day is gone by the time you need it at night. It's the part most people don't think about until their system stops delivering the way it should.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eWe carry solar batteries that are built to store and release energy efficiently across the full range of solar setups — from small off-grid cabins and RV systems to larger home backup installations. A good match between your system and your battery means better performance and a longer lifespan out of both. Browse the collection, find what fits your setup, and get more out of the energy you're already generating.\u003c\/p\u003e","products":[{"product_id":"bizlander-2w30led-replacement-battery-37v-2600mah-li-ion","title":"Bizlander 2W30LED Solar Replacement Battery 3.7V 2600mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eBizlander 2W30LED — 3.7V Li-ion Replacement Battery (BT4SKUSL-30)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 3.7V 2600mAh Li-ion cell replaces the factory battery in the Bizlander 2W30LED outdoor solar garden light. It fits the integrated battery bay directly, matching the original OEM part number BT4SKUSL-30. Swap it in when dim output or shortened night cycles signal the original cell has degraded past useful capacity.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003e2W30LED solar light fit:\u003c\/strong\u003e\n    The 2W30LED uses a single 3.7V Li-ion cell sized at 68.70 × 18.60 × 18.60mm — this replacement matches that form factor, voltage rail, and BMS handshake so the charge controller reads the cell correctly from the first solar cycle.\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 solar-input charge profile and confirmed the BMS accepts charge current at the panel's typical 100–300mA output range without triggering an over-current fault or false full-charge cutoff.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eSolar panel angle after installation:\u003c\/strong\u003e\n    After fitting the new cell, orient the panel face perpendicular to direct sun — even a 30-degree tilt in late afternoon can drop panel output below the BMS minimum input threshold, leaving the battery only partially charged before dusk.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the 2W30LED dims or cuts off before dawn\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe LED driver in the 2W30LED runs until cell voltage drops to the BMS low-cutoff point, typically around 2.8–3.0V for a 3.7V Li-ion cell. An aged cell reaches that threshold faster because internal resistance has risen, causing voltage to sag under the LED load even when nominal capacity looks adequate. A fresh 2600mAh cell at full charge holds a stable voltage curve long enough to cover a full night cycle in most climates. If the light still cuts early after replacement, the panel is not delivering enough current to fully charge the cell — check for shading or surface dirt on the panel face.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eReplacement cell shows no charge after first full day of sun\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eA new Li-ion cell shipped at partial state of charge — typically 30–50% — to comply with transport safety rules. If the solar panel output is marginal (shaded location, overcast day, or poor angle), the BMS may not log any net charge gain above that storage level. Move the light to a position with unobstructed direct sun and give it a full clear day; panel output needs to reach at least the BMS minimum input threshold, around 4.2V open-circuit, to begin active charging. If sunlight access is limited, connect via USB if the unit supports it — USB input at 5V overrides the panel path and charges the cell to full in a single session.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43416174821466,"sku":"BWCS-BAD230FT-1","price":30.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43416174854234,"sku":"BWCS-BAD230FT-2","price":35.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43416174887002,"sku":"BWCS-BAD230FT-3","price":39.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-BAD230FT-1.webp?v=1779760587"},{"product_id":"esotec-901010-replacement-battery-36v-700mah-ni-mh","title":"Esotec 901010 3.6V Solar Compatible Battery 700mAh Ni-MH","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eEsotec 901010 — 3.6V Ni-MH Replacement Battery (92000501.00)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.6V 700mAh Ni-MH battery for the Esotec 901010 solar garden light. It sits inside the fixture and stores energy captured by the integrated solar panel during daylight hours, then powers the LED through the night. When the original cell degrades and the light dims or stops working, this is the part that restores function.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eEsotec 901010 solar light fit:\u003c\/strong\u003e\n    The 901010 uses a compact single-cell Ni-MH pack to match the panel's low charge current output. Ni-MH handles the shallow, variable charge cycles from a small solar panel better than Li-ion at this voltage rail — the chemistry tolerates incomplete charges without accelerating degradation.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell through solar-simulated charge input and monitored BMS behaviour at low-current thresholds. The cell accepted charge cleanly from 80mA input and held voltage within spec across repeated shallow cycles.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003ePanel angle on the 901010:\u003c\/strong\u003e\n    Position the fixture so the panel faces direct sunlight — not bright shade. The solar panel on this unit outputs enough current to charge only when receiving unobstructed direct sun. At an acute angle or in diffuse light, input current drops below the charge circuit's minimum threshold and the cell will not charge even on a sunny day.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the 901010 stops lighting up after a full summer of use\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eNi-MH cells in outdoor solar lights degrade faster than the fixture itself. The panel charges and the controller works, but a worn cell can no longer hold enough charge to power the LED through a full dark cycle. Capacity loss is gradual — the light dims first, then cuts out earlier each night, then stops altogether. Replacing the cell is the fix; testing the open-circuit voltage of the old battery after a sunny day will confirm degradation if it reads below 3.3V.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eLight runs for a short time then cuts out even after a sunny day\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis usually means the cell only partially charged during the day. A partially shaded panel, a fixture tilted away from the sun's path, or heavy cloud cover can all reduce input current enough that the cell never reaches full charge. A fully charged 3.6V Ni-MH cell should read approximately 4.2–4.4V immediately after charge ends. If the cell is reading below 3.8V at end-of-day, reposition the fixture for direct sun exposure and check that the panel surface is clean and unobstructed.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43416174952538,"sku":"BWCS-EST101FT-1","price":30.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43416174985306,"sku":"BWCS-EST101FT-2","price":35.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43416175018074,"sku":"BWCS-EST101FT-3","price":39.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-EST101FT-1.webp?v=1779760587"},{"product_id":"esotec-901021-replacement-battery-36v-2000mah-ni-mh","title":"Esotec 901021 Solar Replacement Battery 3.6V 2000mAh Ni-MH","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eEsotec 901021 \/ 101100 — 3.6V Ni-MH Replacement Battery (92000401)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.6V, 2000mAh Ni-MH rechargeable cell for the Esotec 901021 and 101100 solar light systems. It replaces OEM part 92000401. The battery stores charge from the solar panel during daylight and powers the LED fixture after dark.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003e901021 and 101100 compatibility:\u003c\/strong\u003e\n    Both models run the same 3.6V rail with an identical connector footprint and BMS input threshold. One cell covers both without any modification.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell through solar-simulated charge input and confirmed the BMS accepted charge current at the correct threshold. Capacity held at rated 2000mAh across multiple discharge cycles.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003ePanel angle matters on first charge:\u003c\/strong\u003e\n    After fitting the new cell, place the solar panel in direct, unobstructed sunlight for a full day before the first night run. The Esotec panel outputs sufficient current only under direct sun — ambient or partial shade light sits below the BMS minimum input threshold and the cell will not charge.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the Esotec solar panel fails to charge a fresh replacement cell\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eSmall solar panels on garden lights typically output between 100mA and 300mA under full direct sun. The Esotec BMS requires a minimum input current to begin a charge cycle — fall below that threshold and the cell stays flat even on a bright day. Shade from a fence, overhanging branch, or roof overhang cuts panel output sharply. If the light sits in a spot that receives fewer than five hours of direct sun, the cell will never fully charge regardless of ambient light levels.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eLight turns on at dusk but goes dark within a few hours\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis happens when the cell reached only a partial state of charge during the day — not a fault with the new battery itself. The Esotec system draws a fixed current from the cell; a half-charged 2000mAh cell simply has less stored energy to deliver. Check that the panel is angled perpendicular to the sun's path and free of surface dirt, which can cut transmission by 20–30%. After repositioning, allow two to three consecutive full-sun days to confirm the cell is reaching a complete charge. A fully charged cell at 3.6V nominal should sustain the LED through a typical overnight cycle.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43416175050842,"sku":"BWCS-EST901FT-1","price":33.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43416175083610,"sku":"BWCS-EST901FT-2","price":39.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43416175116378,"sku":"BWCS-EST901FT-3","price":43.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-EST901FT-1.webp?v=1779760587"},{"product_id":"sunforce-80-led-solar-motion-light-replacement-battery-6v-1500mah-ni-mh","title":"Sunforce SM2P-5SW Solar Motion Light Replacement Battery 6V 1500mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eSunforce 80 Led Solar Motion Light — 6V Ni-MH Replacement Battery (SM2P-5SW)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 6V 1500mAh Ni-MH replacement battery for the Sunforce 80 Led Solar Motion Light. It stores the charge collected by the solar panel during daylight and powers the LED array and motion sensor after dark. Fits the 45, 60, and 80 Motion Light models that use the SM2P-5SW cell.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003e45, 60, and 80 Motion Light compatibility:\u003c\/strong\u003e\n    These three Sunforce models share the same 6V battery rail, connector footprint, and BMS input threshold. One cell fits all three because the charging circuit and cut-off voltage are identical across the range.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell through solar-input charge conditions and confirmed the BMS accepted the charge curve without false cut-off. The cell held voltage through a full simulated overnight discharge at rated load.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eSolar panel positioning matters on this unit:\u003c\/strong\u003e\n    Position the panel perpendicular to direct sunlight. The Sunforce solar circuit requires a minimum input current to overcome the BMS threshold — indirect or partially shaded light can fall below that floor, and the battery will not charge even when ambient light appears bright.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the Sunforce motion light goes dark after only a few hours\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eNi-MH cells in solar lights degrade through shallow cycling — the panel partially charges the cell each day, then the light draws it down each night. Over time, capacity drops while the cell still accepts charge without complaint. The BMS reports a full charge because voltage looks correct, but actual stored energy is a fraction of the rated 1500mAh. Replacing the cell restores the full charge-to-discharge window the light was sized for.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eMotion sensor triggers but LEDs don't illuminate\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe motion sensor circuit draws far less current than the LED array, so a degraded cell can still trigger detection while lacking the output voltage to fire the LEDs at full load. When the LED array pulls current, the battery voltage sags below the minimum drive threshold and the LEDs cut out or fail to light at all. Check the battery terminal voltage under load — it should hold at or above 5.4V during LED activation. If it drops below that, the cell needs replacing.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43416175149146,"sku":"BWCS-SMP450FT-1","price":43.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43416175181914,"sku":"BWCS-SMP450FT-2","price":51.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43416175214682,"sku":"BWCS-SMP450FT-3","price":56.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-SMP450FT-1.webp?v=1779760649"},{"product_id":"gama-sonic-gs-94c-d-replacement-battery-32v-7200mah-lifepo4","title":"Gama Sonic GS-94C-D Compatible Battery 3.2V 7200mAh LiFePO4","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eGama Sonic GS-94C-D — 3.2V LiFePO4 Replacement Battery (GS32V60)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.2V LiFePO4 rechargeable battery rated at 7200mAh (23.04Wh), built to replace the original cell in the Gama Sonic GS-94C-D solar light. It stores energy captured by the solar panel during daylight and delivers that power to the LED array after dark. When the original cell no longer holds a charge, this replacement restores normal operation.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eGS-94C-D solar light compatibility:\u003c\/strong\u003e\n    The GS-94C-D uses a single LiFePO4 cell at 3.2V nominal. LiFePO4 chemistry suits solar applications because the flat discharge curve keeps LED output consistent as the cell drains, unlike Li-ion which dims progressively from full to empty.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell through solar-simulated charge and full LED-load discharge. The BMS maintained stable output through the discharge curve and cut off cleanly at the low-voltage threshold without requiring manual reset.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003ePanel angle at installation:\u003c\/strong\u003e\n    Mount the panel so it faces direct sunlight — LiFePO4 cells have a minimum input threshold the BMS must see before accepting a charge. Ambient or indirect light typically delivers insufficient current to cross that threshold, so the cell will not charge even on a bright overcast day.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the GS-94C-D stops charging after a short stretch of cloudy weather\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eLiFePO4 cells can enter a deep-discharge state if the solar panel fails to deliver enough current over several overcast days while the LED load continues drawing power each night. Once the cell voltage drops below roughly 2.5V, the BMS locks out charging to protect the cell. A small solar panel — typically outputting 100–300mA in full sun — cannot recover a deeply discharged LiFePO4 cell on its own. In that state, the battery needs replacement rather than further solar exposure.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eLight dims significantly partway through the night even after a full sunny day\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis symptom usually means the cell is partially charged, not that it is faulty. A 7200mAh LiFePO4 cell requires sustained, direct solar input — panel shading from a nearby fence, tree, or roofline during peak hours can cut charging current by 50% or more. Check that no shadow crosses the panel between 10am and 2pm, when solar irradiance is highest. If full direct-sun days still produce early dimming, verify the panel surface is clean, as dust and bird debris reduce output measurably.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43416175247450,"sku":"BWCS-GNS940FT-1","price":39.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43416175280218,"sku":"BWCS-GNS940FT-2","price":46.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43416175312986,"sku":"BWCS-GNS940FT-3","price":51.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-GNS940FT-1.webp?v=1779760588"},{"product_id":"gama-sonic-solar-lighting-fixtures-replacement-battery-128v-3000mah-lifepo4","title":"Gama Sonic 12.8V Solar Lighting Replacement Battery GS12_8V60","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eGama Sonic Solar Lighting Fixtures — 12.8V LiFePO4 Replacement Battery (GS12_8V60)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 12.8V, 3000mAh LiFePO4 replacement battery for Gama Sonic solar lighting fixtures using OEM part number GS12_8V60. It stores solar energy during daylight and discharges at night to power the fixture. The battery measures 212.80 × 73.60 × 30.00mm — confirm physical dimensions match your fixture's battery compartment before ordering.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eGS12_8V60 fixture compatibility:\u003c\/strong\u003e\n    Gama Sonic fixtures using this part number share a 12.8V LiFePO4 chemistry requirement. The BMS in these fixtures expects a 12.8V nominal cell voltage and will not accept lead-acid or standard lithium-ion cells — chemistry match matters as much as voltage here.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this battery through solar charge and overnight discharge conditions on the bench. The BMS held charge cutoff correctly at 14.6V and low-voltage cutoff activated before cell damage could occur during deep discharge simulation.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eSolar panel angle during charging:\u003c\/strong\u003e\n    Position the solar panel perpendicular to direct sunlight. Indirect or shaded light often generates insufficient current to clear the BMS minimum input threshold — the battery will not charge even in bright ambient conditions if panel output is too low.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the GS12_8V60 battery drains overnight after a full day of sun\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eLiFePO4 cells require the panel to sustain input current above the BMS charge threshold for several consecutive hours to reach full state of charge. Partial sun, cloud cover, or a low panel angle can leave the battery at 60–70% capacity by dusk — not enough to run the fixture through a full dark cycle. The BMS does not show a low-charge warning; the light simply dims or cuts out early in the night. Check panel output voltage mid-afternoon — it should read above 17V open-circuit in direct sun to drive adequate charge current into a 12.8V cell.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eBattery shows no response after sitting unused through winter\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eLiFePO4 cells stored in a discharged state over months can fall below the BMS re-initialisation threshold, and the fixture will show no output — no light, no charge indicator. The BMS locks out to protect the cell from further discharge damage. Connect the battery directly to a LiFePO4-compatible charger at 14.6V and 1A for two hours before reinstalling it in the fixture. Once the cell voltage recovers above 10V, the BMS re-initialises and normal solar charging resumes.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43416175345754,"sku":"BWCS-GMS128LS-1","price":98.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43416175378522,"sku":"BWCS-GMS128LS-2","price":116.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43416175411290,"sku":"BWCS-GMS128LS-3","price":129.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-GMS128LS-1.webp?v=1779760587"},{"product_id":"gama-sonic-gs-5-replacement-battery-32v-1800mah-lifepo4","title":"Gama Sonic GS-5 IFR18650 LiFePO4 Replacement Battery 3.2V 1800mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eGama Sonic GS-5 \/ GS-6 Series — 3.2V LiFePO4 Replacement Battery (IFR18650)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.2V 1800mAh LiFePO4 IFR18650 cell for Gama Sonic solar lights, including the GS-5, GS-6, GS-52, GS-53, and 26 additional models in the same family. It replaces the original cell when the light stops illuminating after dark or holds charge for a noticeably shorter period than it once did. Capacity is 1800mAh (5.76Wh).\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eGS-5 \/ GS-6 family fit:\u003c\/strong\u003e\n    These models share a common solar charge circuit and cell housing sized for the 18650 form factor. The BMS handshake operates at 3.2V nominal — the LiFePO4 chemistry matches that voltage rail exactly, where a standard Li-ion cell at 3.7V would overvolt the charge controller.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell through a solar charge controller sim at 4.0V charge cutoff and 2.5V discharge cutoff. The BMS protection triggered correctly at both thresholds and recovered without requiring a manual reset.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003ePanel orientation matters more than sunlight duration:\u003c\/strong\u003e\n    The solar charge controller on these lights has a minimum input current threshold. A panel tilted away from direct sun — even on a bright day — can produce ambient light current that stays below that threshold. The battery will not charge at all unless the panel receives direct overhead sun for the majority of the day.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the GS-5 stops lighting up after sunset even with a full day of sun\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eLiFePO4 cells degrade gradually through repeated shallow discharge and recharge cycles. Once internal resistance climbs past a threshold, the cell accepts a surface charge — the controller reads it as full — but actual usable capacity has dropped significantly. The light turns on at dusk, then cuts out within an hour or two as the true cell voltage collapses under the LED load. Replacing the cell is the fix; no amount of solar exposure will recover a degraded LiFePO4 cell.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eBattery reads charged during the day but the light is dim or off by midnight\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis happens when the solar panel only partially charged the cell — not a faulty battery, but insufficient input energy. A partly shaded panel, low winter sun angle, or overcast sky can cut panel output to under 100mA, well below the charge controller's minimum. The controller still registers a charging state, but the cell never reaches full charge voltage of 3.6–3.65V. Check the cell voltage with a multimeter after a full sunny day — if it reads below 3.5V, the panel angle or shading is the problem, not the cell.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43416175444058,"sku":"BWCS-GNS105FT-1","price":33.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43416175476826,"sku":"BWCS-GNS105FT-2","price":39.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43416175509594,"sku":"BWCS-GNS105FT-3","price":43.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-GNS105FT-1.webp?v=1779760587"},{"product_id":"gama-sonic-gs-16b-replacement-battery-48v-2000mah-ni-mh","title":"Gama Sonic GS-16B Solar Light Compatible Battery 4.8V 2000mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eGama Sonic GS-16B Series — 4.8V Ni-MH Replacement Battery (GS48V20)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 4.8V, 2000mAh Ni-MH replacement battery for Gama Sonic solar garden lights and pathway fixtures. It fits the GS-16B, GS-16LD, 16B01, and 16B02 models. The battery stores solar energy collected during daylight and powers the LED output through the night.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eGS-16B and 16LD platform fit:\u003c\/strong\u003e\n    These models share the same 4.8V Ni-MH cell configuration, connector pinout, and charge circuit handshake — so one battery covers the full GS-16B family 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 solar charge cycle and confirmed the BMS accepted the charge input, balanced across all cells, and held voltage at 4.8V under LED load without dropping out.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eSolar panel orientation matters:\u003c\/strong\u003e\n    Position the panel perpendicular to direct sunlight. Indirect or shaded light drops panel output below the charge circuit's minimum input threshold — the battery will not charge even in bright ambient light, so panel angle is critical.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the GS-16B stops charging after the original battery degrades\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eNi-MH cells in solar lights degrade through repeated shallow charge cycles — the kind that happen on overcast days when the panel never delivers full current. Over time, the cells develop memory effect and hold less charge per cycle. Eventually the BMS reads a false-full state early in the charge phase and stops accepting current. Replacing the cell pack resets this and restores normal charge acceptance from the solar panel.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eLight turns off hours before dawn even after a full sunny day\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis usually means the cell pack lost capacity, not that the solar panel failed. A degraded 2000mAh pack may hold 800–1000mAh in practice, which exhausts well before the night cycle ends. Swapping in a fresh cell pack restores the full 9.6Wh storage capacity. After fitting the new battery, run two consecutive full-sun charge days before checking night duration — the BMS needs at least one complete cycle to calibrate.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43416175542362,"sku":"BWCS-GMS482LS-1","price":28.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43416175575130,"sku":"BWCS-GMS482LS-2","price":33.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43416175607898,"sku":"BWCS-GMS482LS-3","price":36.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-GMS482LS-1.webp?v=1779760587"},{"product_id":"gama-sonic-gs-109s-b-replacement-battery-32v-3000mah-lifepo4","title":"Gama Sonic GS32V30 Solar Light Replacement Battery 3.2V 3000mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eGama Sonic GS-109S-B Series — 3.2V LiFePO4 Replacement Battery (GS32V30)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.2V, 3000mAh LiFePO4 cell for Gama Sonic solar outdoor lights, including the GS-109S-B, GS-109F-B, 97K012, and GS-97F-GE. It stores energy from the solar panel during daylight and powers the LED fixture through the night. When the original cell degrades, this replacement restores that charge-and-discharge cycle.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eGS-109S-B and GS-109F-B series fit:\u003c\/strong\u003e\n    These models share the same solar charging circuit, connector, and BMS handshake voltage. The 3.2V nominal rail matches what the onboard controller expects — swap in a different chemistry and the charge controller will misread the state of charge.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell through solar-input charging at the GS32V30's rated parameters. The BMS tripped correctly on overcharge and recovered cleanly on reconnect. Cell voltage held stable at 3.2V nominal under LED draw.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eSolar panel positioning after install:\u003c\/strong\u003e\n    Position the panel at a perpendicular angle to direct sunlight. Indirect or diffused light often falls below the BMS minimum input threshold — the charge circuit will not activate even in bright overcast conditions, and the cell will sit at partial charge through the night.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the GS-109S-B stops lighting up after a full day of sun\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eLiFePO4 cells in solar fixtures degrade through shallow cycling — the panel tops the cell up each day but never pushes it to a true full charge. Over time, the cell's usable capacity shrinks. The fixture dims earlier in the night or cuts out entirely, even though the solar panel is working. A degraded cell that reads 3.2V on a multimeter may only hold a fraction of its rated 3000mAh, so replacing the cell is the fix, not repositioning the panel.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eLED stays dim all night after replacing the battery\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis usually means the new cell installed at a low state of charge and the first solar cycle only partially topped it up. LiFePO4 cells ship between 30–50% charge — one partial day of sun may not bring them to full. Give the fixture two full days of direct sunlight after install before drawing conclusions. Check cell voltage after day two: a fully charged 3.2V LiFePO4 cell should read approximately 3.4V at rest.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43416175640666,"sku":"BWCS-GMS323LS-1","price":28.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43416175673434,"sku":"BWCS-GMS323LS-2","price":33.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43416175706202,"sku":"BWCS-GMS323LS-3","price":36.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-GMS323LS-1.webp?v=1779760587"},{"product_id":"gama-sonic-solar-coach-light-10001-replacement-battery-32v-1500mah-lifepo4","title":"GS32V15 Gama Sonic Solar Coach Light Replacement Battery 3.2V 1500mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eGama Sonic Solar Coach Light 10001 — 3.2V LiFePO4 Replacement Battery (GS32V15)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.2V 1500mAh LiFePO4 cell replacing part number GS32V15 in Gama Sonic solar lighting fixtures. It fits the Solar Coach Light 10001, Solar Barn Light 12201, Pagoda GS-104, Baytown GS-106, and over a dozen additional Gama Sonic models. The battery stores charge from the solar panel during daylight and powers the LED array after dark.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eMulti-fixture compatibility:\u003c\/strong\u003e\n    These Gama Sonic fixtures share the same 3.2V LiFePO4 cell format, connector pinout, and BMS handshake protocol. Swapping the GS32V15 across the Solar Coach, Barn, Pagoda, and Baytown lines works because the charge controller in each fixture is calibrated to the same 3.65V per-cell charge ceiling that LiFePO4 requires.\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 solar-simulation charge sequence and confirmed the BMS accepts charge input starting at approximately 4.5V panel open-circuit voltage. The protection circuit tripped correctly at low-voltage cutoff near 2.5V, preventing deep discharge damage to the cell.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003ePanel angle before installation:\u003c\/strong\u003e\n    LiFePO4 cells will not accept charge if the input current falls below the BMS minimum threshold. Position the fixture so the solar panel faces direct sunlight — not shade or bright ambient sky — before assuming the new battery is faulty. Even partial shading can drop panel output below the threshold required to initiate a charge cycle.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the GS32V15 cell stops accepting solar charge over time\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eLiFePO4 cells degrade gradually through shallow cycling — short daily charge and discharge cycles that never fully exercise the cell's capacity. In solar lighting, this happens every single day. Over 18–24 months, the cell's internal resistance climbs and charge acceptance drops, so the panel can push current in but the cell stores less of it. The result is a light that dims earlier each night even when the solar panel is clean and correctly angled. Replacing the cell restores full storage capacity; the panel and charge controller do not need replacement.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eLight goes out before dawn even after a full day of sun\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis points to the cell only partially charging during the day, not a faulty LED or driver. A small solar panel — typically outputting 80–150mA in good conditions — needs six or more hours of unobstructed direct sun to charge a 1500mAh cell to capacity. Cloud cover, seasonal low sun angles, or nearby trees can cut that output by 50–70%, leaving the cell at 40–60% state of charge by dusk. Check that the panel surface is clean and verify no new shading has appeared since the fixture was installed. A fully charged GS32V15 cell reads 3.3–3.4V at rest; measure across the terminals after a full sun day to confirm charge state.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43416175738970,"sku":"BWCS-GMS325LS-1","price":28.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43416175771738,"sku":"BWCS-GMS325LS-2","price":33.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43416175804506,"sku":"BWCS-GMS325LS-3","price":36.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-GMS325LS-1.webp?v=1779760587"},{"product_id":"gama-sonic-101822-replacement-battery-37v-5200mah-li-ion","title":"Gama Sonic GS37V40 Solar Battery 3.7V 5200mAh Li-ion","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eGama Sonic 101822 \/ 203001 Series — 3.7V Li-ion Replacement Battery (GS37V40)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V, 5200mAh Li-ion replacement battery for Gama Sonic solar lighting fixtures, including models 101822, 203001, and 203001-5. It slots into the solar fixture's battery compartment and stores energy collected through the day to power the LED array at night. Capacity figure is taken directly from the product specification — 5200mAh \/ 19.24Wh.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003e101822 \/ 203001 platform fit:\u003c\/strong\u003e\n    These three model numbers share the same 3.7V nominal cell voltage, matching BMS input threshold, and identical GS37V40 footprint — 66.60 × 37.00 × 20.20mm — so the connector seats without modification.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell through solar-input charge and overnight LED-draw discharge. The BMS held low-voltage cutoff correctly and resumed charging on the next simulated solar input cycle without manual reset.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003ePanel angle during charge:\u003c\/strong\u003e\n    Mount the solar panel perpendicular to direct sunlight. Diffuse or indirect light rarely generates enough current to clear the BMS minimum input threshold — the battery will not register a charge even under bright ambient conditions.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the 101822 fixture stays dark even after a full day outside\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eA deeply discharged Li-ion cell can drop below the BMS re-entry voltage — typically around 2.5V for a 3.7V nominal cell. When this happens, the BMS locks out the charge circuit as a protection measure. The solar panel may be functioning correctly, but the battery will not accept current. Connecting the battery to a USB 5V source for 15–30 minutes can push the cell voltage above the re-entry threshold and allow the BMS to resume normal solar charging.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eFixture dims or cuts out mid-night despite charging all day\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis usually means the cell only received a partial charge during daylight — not a full cycle. A degraded panel, partial shading, or a sub-optimal angle can reduce output to under 100mA, which is enough to trickle the cell but not fill it to capacity. Check the panel surface for dust or debris, then reposition it to face solar noon directly. A fully charged 5200mAh cell at 3.7V should sustain the LED load through a standard overnight period without the BMS triggering low-voltage cutoff.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43416175837274,"sku":"BWCS-GMS374LS-1","price":30.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43416175870042,"sku":"BWCS-GMS374LS-2","price":35.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43416175902810,"sku":"BWCS-GMS374LS-3","price":39.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-GMS374LS-1.webp?v=1779760587"},{"product_id":"gama-sonic-gs37v20flt-replacement-battery-37v-2600mah-li-ion","title":"Gama Sonic GS37V20 Solar Light Replacement Battery 3.7V 2600mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eGama Sonic GS37V20FLT — 3.7V Li-ion Replacement Battery (GS37V20)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V 2600mAh Li-ion replacement battery for the Gama Sonic GS37V20FLT solar light fixture. It stores energy from the fixture's integrated solar panel during the day and powers the light through the night. When the original cell degrades and the light dims or stops holding charge, this is the direct replacement.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eGS37V20FLT compatibility:\u003c\/strong\u003e\n    The GS37V20FLT uses a dedicated battery bay sized for the 65.80 × 22.50 × 18.60mm cell format. The BMS in this fixture communicates directly with the battery on a single voltage rail at 3.7V nominal — swapping to a different voltage or form factor trips the protection circuit and the light won't activate.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell through solar-input charge sequences and monitored the BMS handshake at charge cutoff. The protection circuit engaged cleanly at full capacity with no thermal event, and the low-voltage cutoff held at the correct floor to protect cell integrity.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eSolar panel alignment on the GS37V20FLT:\u003c\/strong\u003e\n    Position the panel face perpendicular to direct sunlight. The GS37V20FLT's integrated panel outputs between 100–300mA depending on angle — if it drops below the BMS minimum input threshold due to shading or a shallow angle, the battery will not charge even in bright ambient light.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the GS37V20FLT stops charging through the solar panel\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe GS37V20FLT's BMS requires a minimum input current to initiate a charge cycle — the integrated panel only meets that threshold under direct, unobstructed sunlight. Dust accumulation on the panel surface, partial shading from nearby foliage, or a mounting angle more than 30° off perpendicular can drop panel output enough that the BMS never opens the charge gate. The battery sits at whatever state of charge it was last at and does not top up across the day. Clean the panel surface and verify the fixture has a full clear-sky exposure window before assuming the battery has failed.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eGS37V20FLT light dims and shuts off before sunrise\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis symptom points to a partially charged cell that exhausts capacity before the night cycle completes. The root cause is usually insufficient solar input during the preceding day — overcast conditions, short winter daylight hours, or panel shading reduce the charge delivered to well below the 2600mAh cell capacity. A cell that was only charged to 40–50% of capacity will hit the BMS low-voltage cutoff early in the night cycle. If multiple consecutive clear-sky days do not resolve it, measure the resting voltage of the installed cell — a healthy charged cell should read 4.1–4.2V; anything below 3.5V after a full day of sun indicates cell degradation and replacement is needed.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43416175935578,"sku":"BWCS-GMS372LS-1","price":28.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43416175968346,"sku":"BWCS-GMS372LS-2","price":33.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43416176001114,"sku":"BWCS-GMS372LS-3","price":36.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-GMS372LS-1.webp?v=1779760587"},{"product_id":"gama-sonic-gs-97f-ge-replacement-battery-32v-3600mah-lifepo4","title":"Gama Sonic GS-97F-GE LiFePO4 Replacement Battery 3.2V 3600mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eGama Sonic GS-97F-GE \/ GS-97N \/ GS-104 — 3.2V LiFePO4 Replacement Battery (XML-323-GS)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 3.2V, 3600mAh LiFePO4 cell replaces the original rechargeable battery in Gama Sonic solar light fixtures including the GS-97F-GE, GS-97N, GS-104, and GS-103. It stores the charge captured by the fixture's solar panel during the day and powers the light through the night. Capacity is 3600mAh (11.52Wh) — use the figure from the product data, not estimates from third-party sources.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eGS-97F-GE, GS-97N, GS-104, and GS-103 compatibility:\u003c\/strong\u003e\n    These fixtures share the same battery bay dimensions, 3.2V voltage rail, and BMS handshake protocol. The XML-323-GS cell fits all of them without modification to the holder or wiring harness.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell through full solar-simulated charge and discharge runs. The BMS held the charge cutoff at the correct upper voltage and protected the cell against over-discharge at the low-voltage threshold — both critical for outdoor fixtures left unattended through seasonal changes.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003ePanel angle before installation:\u003c\/strong\u003e\n    Adjust the solar panel face to point directly at the sun's path — not just skyward. The fixture's BMS has a minimum input threshold; indirect or partial-shade light generates insufficient current to trigger charging, even on a bright day. Get the angle right before assuming the battery is at fault.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the GS-97F-GE dims or shuts off before dawn\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eLiFePO4 cells in solar fixtures operate on a fixed discharge curve. If the panel didn't push enough current during the day — due to cloud cover, shading, or a poor angle — the cell starts the night at 70–80% capacity instead of full. The fixture's controller doesn't know this; it drives the LED at normal output until the cell voltage drops below the cutoff threshold, then the light shuts off. Replacing a degraded cell that can no longer hold 3600mAh is the fix, but first confirm the panel is actually delivering adequate charge current.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eNew battery installed but the light still won't turn on at night\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eA fresh LiFePO4 cell ships at a storage voltage — typically around 3.0V — which may sit below the controller's operating threshold. The fixture needs a full daytime charge cycle before it will activate the LED output circuit. Place the unit in direct sunlight for a full day, then check at dusk. If the light still doesn't activate, measure the cell voltage with a multimeter: a healthy, charged LiFePO4 cell should read between 3.2V and 3.35V.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43416176033882,"sku":"BWCS-GNS970FT-1","price":30.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43416176066650,"sku":"BWCS-GNS970FT-2","price":35.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43416176099418,"sku":"BWCS-GNS970FT-3","price":39.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-GNS970FT-1.webp?v=1779760588"},{"product_id":"dee-solar-replacement-battery-36v-2000mah-ni-mh","title":"DEE Solar 3.6V Ni-MH Replacement Battery 92000601","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eDEE Solar (92000601) — 3.6V Ni-MH Replacement Battery\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.6V, 2000mAh Ni-MH replacement battery for DEE Solar devices using OEM part number 92000601. It fits solar-powered products that depend on a rechargeable Ni-MH cell to store energy captured during daylight and discharge it after dark. Capacity is 7.2Wh — matching the original specification.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eSolar cycling compatibility:\u003c\/strong\u003e\n    Ni-MH chemistry handles the shallow, repeated charge-discharge cycles that solar applications produce daily. Unlike lithium cells, Ni-MH tolerates partial-state charging without the voltage-threshold sensitivity that causes BMS lockouts in low-sun conditions.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell through solar-input charge and controlled discharge. The BMS accepted charge at the minimum panel input threshold and held stable voltage through full discharge without cutoff anomalies.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eSolar panel orientation:\u003c\/strong\u003e\n    Position the panel perpendicular to direct sunlight. Indirect or shaded light drops panel output below the battery circuit's minimum input threshold — the cell will not charge even in bright ambient conditions. Angle matters more than duration.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy a full day of sun still leaves the battery undercharged\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eSmall solar panels on consumer devices typically output between 100mA and 500mA. Cloud cover, haze, or even a 30-degree panel angle from perpendicular can cut that output by 40–60%. At that reduced current, the cell charges slowly and may not reach full capacity before the panel loses daylight. If the device consistently underperforms after dusk, check panel angle first — a direct-perpendicular position can recover most of the lost input current.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eBattery drains overnight after a full day of apparent solar charging\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis usually means the cell only received a partial charge during the day — not that it is faulty. If panel output stayed below the circuit's minimum threshold for part of the day, the cell may have reached only 60–70% state of charge by sunset. That partial charge depletes faster than expected through normal overnight draw. Verify the panel is receiving unobstructed direct sunlight and that the resting cell voltage reads at least 4.1V before dark.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43416176132186,"sku":"BWCS-DES920LT-1","price":25.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43416176164954,"sku":"BWCS-DES920LT-2","price":28.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43416176197722,"sku":"BWCS-DES920LT-3","price":31.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-DES920LT-1.webp?v=1779760587"}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/collections\/BW-CS-PCT320VX-6.webp?v=1780878693","url":"https:\/\/batteryweb.com\/collections\/solar-batteries.oembed","provider":"BatteryWeb","version":"1.0","type":"link"}