{"product_id":"lenovo-thinkpad-x1-nano-gen-2-21e8001kee-replacement-battery-1161v-4150mah-li-polymer","title":"Lenovo ThinkPad X1 Nano Gen 2 L21C3P74 Compatible Battery 11.61V 48.18Wh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eLenovo ThinkPad X1 Nano Gen 2 — 11.61V Li-Polymer Replacement Battery (L21C3P74)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is an 11.61V, 4150mAh (48.18Wh) Li-Polymer battery for the Lenovo ThinkPad X1 Nano Gen 2. It fits the 21E8001KEE, 21E8001QRI, 21E80024UE, 21E80005EQ, and over 120 additional X1 Nano Gen 2 configurations. It replaces OEM part numbers L21C3P74, L21D3P74, L21L3P74, L21M3P74, 5B11F28680, 5B11F28682, SB11B44632, SB11F28677, and SB11F28679.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eX1 Nano Gen 2 platform fit:\u003c\/strong\u003e\n    All listed Gen 2 variants share the same 11.61V three-cell Li-Polymer architecture, connector pinout, and BMS handshake protocol. One cell covers every SKU in that generation 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 charge, discharge, and system wake events on the X1 Nano Gen 2 platform. The BMS communicated correctly with the EC firmware, and the charge controller accepted the cell without fault codes.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003ePost-install calibration on the X1 Nano Gen 2:\u003c\/strong\u003e\n    After fitting the new cell, run one full discharge until the laptop hibernates, then charge uninterrupted to 100%. This resets the BIOS battery learn cycle and clears the inaccurate health warning that appears after every 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 battery health as poor after replacement on the X1 Nano Gen 2\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe X1 Nano Gen 2 stores battery health data in the embedded controller's EEPROM, which retains metrics from the old cell after a swap. When the new cell's EEPROM data doesn't match the EC's learned values, ThinkPad BIOS flags the battery as degraded or unknown — even on a brand-new cell. This is a calibration state, not a hardware fault. Run the BIOS battery gauge reset under Power Manager or complete one full discharge-to-hibernate followed by an uninterrupted full charge to re-anchor the health baseline.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eThinkPad X1 Nano Gen 2 shutting down at 20–30% charge shown\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis happens when the fuel gauge IC hasn't yet mapped the new cell's actual voltage-to-capacity curve. The EC predicts remaining charge based on the old cell's profile and miscalculates the voltage cliff point, cutting power before the display shows zero. It's not a faulty cell — it corrects after two to three full calibration cycles. Discharge to hibernate, charge fully to 100%, and repeat twice; the OS percentage and actual cutoff voltage will align by the third cycle.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43409546084442,"sku":"BWCS-LVX122NB-1","price":98.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43409546117210,"sku":"BWCS-LVX122NB-2","price":116.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43409546149978,"sku":"BWCS-LVX122NB-3","price":129.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-LVX122NB-1.webp?v=1779579986","url":"https:\/\/batteryweb.com\/products\/lenovo-thinkpad-x1-nano-gen-2-21e8001kee-replacement-battery-1161v-4150mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}