{"product_id":"lenovo-ideapad-s10-2-replacement-battery-111v-4400mah-li-ion","title":"Lenovo IdeaPad S10-2 Compatible Battery 11.1V 4400mAh L09C3B12","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eLenovo IdeaPad S10-2 Series — 11.1V Li-ion Replacement Battery (L09C3B12)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is an 11.1V 4400mAh (48.84Wh) Li-ion replacement battery for the Lenovo IdeaPad S10-2 netbook. It fits the S10-2, S10-2 20027, and S10-2 2957 variants. OEM part numbers covered include L09C3B12, L09C6Y12, L09M3B11, 55Y9382, 55Y9383, and several others listed in the compatibility table.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eS10-2 variant compatibility:\u003c\/strong\u003e\n    The 20027 and 2957 sub-models share the same 11.1V three-cell architecture, connector pinout, and BMS handshake protocol — which is why a single cell covers all three board revisions without modification.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell on the S10-2 platform and confirmed the BMS negotiates correctly at initial power-on, charge current ramps normally from the AC adapter, and the protection circuit trips at expected low-voltage cutoff without false disconnects.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003ePost-install calibration on the S10-2:\u003c\/strong\u003e\n    After fitting this cell, run one full discharge to hibernate cutoff, then charge uninterrupted to 100% without interruption. This resets the BIOS battery learn cycle and clears the inaccurate health warning that appears after every cell swap on this platform.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the IdeaPad S10-2 shuts down at 20–30% after a battery swap\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe S10-2 BIOS tracks a discharge curve learned from the previous cell. After a swap, it applies the old curve to a new cell — and those curves don't match. Under combined CPU and display load, the new cell's voltage drops faster than the stored curve predicts, triggering a false low-voltage shutdown well above actual empty. Running two to three full discharge-to-recharge cycles overwrites the stored curve. Once calibrated, the BIOS reads the new cell accurately and shutdowns at 20–30% stop occurring.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eBIOS reporting 0% or \"unknown\" battery immediately after installation\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe IdeaPad S10-2 reads battery identity and state-of-charge from EEPROM data embedded in the battery pack. A freshly installed cell has no discharge history in that register, so the BIOS fuel gauge IC has no reference point and reports 0% or flags the battery as unknown. This is not a fault with the cell itself. Plug in the AC adapter, let the battery charge to 100% without interruption, then allow a full discharge to hibernate — after that first cycle the fuel gauge IC maps the new cell correctly and the percentage reading stabilises.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43410810404954,"sku":"BWCS-IBS10NT-1","price":103.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43410810437722,"sku":"BWCS-IBS10NT-2","price":117.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43410810470490,"sku":"BWCS-IBS10NT-3","price":128.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-IBS10NT-1.webp?v=1779581158","url":"https:\/\/batteryweb.com\/products\/lenovo-ideapad-s10-2-replacement-battery-111v-4400mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}