{"product_id":"lenovo-yoga-c940-14iil-replacement-battery-77v-7650mah-li-polymer","title":"Lenovo Yoga C940-14IIL Compatible Battery 7.7V 7650mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eLenovo Yoga C940-14IIL — 7.7V Li-Polymer Replacement Battery (L18C4PH0 \/ 5B10T11585)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 7.7V, 7650mAh (58.91Wh) lithium-polymer battery is a direct cell replacement for the Lenovo Yoga C940-14IIL convertible ultrabook. It covers the full C940-14IIL lineup, including the 81Q9 series and regional variants. OEM part numbers include L18C4PH0, L18M4PH0, 5B10T11585, 5B10T11586, 5B10T11686, 5B10W67180, 5B10W67374, SB10W67323, and SB10W67416.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eC940-14IIL series coverage:\u003c\/strong\u003e\n    The entire 81Q9 model range shares the same battery bay dimensions, connector pinout, and BMS communication protocol. Voltage rail and physical footprint are identical across all regional SKUs, so one cell fits the full lineup 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 the C940-14IIL under combined CPU and display load. The BMS held the 7.7V rail steady through charge and discharge cycles, and the protection circuitry triggered correctly at both low-voltage cutoff and overcharge thresholds.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003ePost-swap calibration on the C940-14IIL:\u003c\/strong\u003e\n    After fitting this cell, run one full discharge until the laptop hibernates, then charge uninterrupted to 100%. This forces the BIOS battery learn cycle to reset against the new cell and clears the inaccurate health warning that appears after every cell replacement 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\"\u003eBIOS reporting poor battery health immediately after fitting a new cell\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe Lenovo BIOS reads health data from EEPROM embedded in the battery's BMS. When you swap cells, the EEPROM carries capacity and cycle data from the new cell, but the BIOS compares it against the charge history it stored for the old cell. This mismatch triggers a false \"poor health\" or \"replace battery\" warning even when the new cell is in full working order. Running one complete discharge-to-hibernate followed by an uninterrupted full charge allows the BIOS learn cycle to rewrite its baseline against the new cell. After two or three full cycles, the health indicator normalises.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eYoga C940-14IIL shutting down at 20–30% charge shown on screen\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis happens when the fuel gauge IC hasn't completed calibration against the new cell yet. The gauge's charge map still reflects the old cell's voltage curve, so it reports 25% while the actual cell voltage has already dropped below the safe operating floor under full CPU and display load. The laptop's hardware protection circuit then forces an abrupt shutdown before the OS can initiate a clean hibernate. To fix it, run two full discharge-to-hibernate and full-charge cycles without interruption — by the end of the second cycle, the fuel gauge IC has rebuilt its map against the new cell and reported percentage will track actual voltage accurately. Confirm the cell is recovering fully by checking Lenovo Vantage, which should show the cell voltage climbing above 7.6V during the final charge phase.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43306866049114,"sku":"BWCS-LVC941NB-1","price":411.99,"currency_code":"USD","in_stock":false},{"title":"Warranty 2 Year","offer_id":43306866081882,"sku":"BWCS-LVC941NB-2","price":491.99,"currency_code":"USD","in_stock":false},{"title":"Warranty 3 Year","offer_id":43306866114650,"sku":"BWCS-LVC941NB-3","price":551.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-LVC941NB_1.webp?v=1777768838","url":"https:\/\/batteryweb.com\/products\/lenovo-yoga-c940-14iil-replacement-battery-77v-7650mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}