{"product_id":"uniwill-l50-replacement-battery-108v-4400mah-li-ion","title":"Uniwill L50 10.8V Replacement Battery 805N00045 4400mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eUniwill L50 Series — 10.8V Li-ion Replacement Battery (805N00045)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 10.8V, 4400mAh Li-ion battery for the Uniwill L50 notebook line. It fits the L50, L50II0, L50II5, and L50RI0 among other L50 and L51 variants. Cell capacity matches the original 47.52Wh specification listed in Uniwill's OEM data.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eL50 and L51 platform compatibility:\u003c\/strong\u003e\n    Both series share the same 3S cell configuration, connector pinout, and BMS handshake protocol. A battery carrying any of the 3S4000 or 3S4400 part numbers slots directly into either chassis without adapter or firmware change.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell through charge, discharge, and BMS trip conditions on an L50 board. The protection circuit responded correctly to over-discharge and over-current events, and the SMBus communication with the motherboard stayed stable across the full charge window.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003ePost-install calibration cycle:\u003c\/strong\u003e\n    After fitting this battery, run the laptop down to hibernate cutoff, then charge uninterrupted to 100%. This resets the BIOS battery learn cycle and clears the inaccurate health warning that appears after a cell swap.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eBIOS reporting poor battery health immediately after fitting a new cell\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe L50's BIOS reads health data from EEPROM registers that the old battery wrote over years of use. A fresh cell arrives with default register values, which the BIOS interprets as degraded or unknown. This is not a fault with the new battery. Run one full discharge-to-hibernate followed by an uninterrupted charge to 100% — this triggers the learn cycle and overwrites the stale EEPROM reference. After one or two cycles the health status corrects itself.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eLaptop shuts down abruptly at 20–30% charge shown on the gauge\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis happens when the fuel gauge IC is still calibrated to the old cell's voltage curve. The gauge thinks 20% capacity remains, but the new cell's actual open-circuit voltage at that point sits above what the old degraded cell could sustain. Under full CPU and display load, the voltage drops fast, the BMS trips the output, and the laptop cuts off without warning. Force a full discharge to hibernate at the lowest screen brightness setting to let the IC map the new cell's real low-voltage floor. After two full cycles the cutoff point stabilises at or below 5% shown.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43410819776602,"sku":"BWCS-UNL50NB-1","price":91.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43410819809370,"sku":"BWCS-UNL50NB-2","price":103.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43410819842138,"sku":"BWCS-UNL50NB-3","price":112.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-UNL50NB-1.webp?v=1779581212","url":"https:\/\/batteryweb.com\/products\/uniwill-l50-replacement-battery-108v-4400mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}