{"product_id":"lenovo-k42-replacement-battery-111v-4400mah-li-ion","title":"Lenovo K42 Notebook Replacement Battery 11.1V 4400mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eLenovo K42 \/ E42 Series — 11.1V Li-ion Replacement Battery (BATEL80L6)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 11.1V, 4400mAh Li-ion battery replaces the original cell in Lenovo K42, E42, E42G, and E42L notebooks. It matches the OEM voltage rail, connector pinout, and BMS communication spec for these models. Capacity figure is 48.84Wh, taken from product data — not estimated.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eK42 and E42 platform compatibility:\u003c\/strong\u003e\n    These models share the same battery bay geometry, 11.1V three-cell configuration, and SMBus BMS handshake. BATEL80L6, BATEL80L9, BATFL91L6, and ASM P\/N BATFT10L61 are cross-references for the same physical and electrical spec — all covered here.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell on a K42 unit and confirmed the BMS initialised correctly, reported state-of-charge to the OS, and accepted a full charge cycle without triggering a protection cutoff or throwing a BIOS health warning after the learn cycle completed.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003ePost-install calibration on Lenovo K42:\u003c\/strong\u003e\n    After fitting this cell, drain the battery fully until the laptop hibernates, then charge uninterrupted to 100% without unplugging. This single cycle 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\"\u003eBIOS reporting poor battery health immediately after replacement\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe K42 BIOS reads health data from the battery's EEPROM on first boot. A new cell carries factory EEPROM values that don't match the charge history the BIOS expects from a seated, calibrated pack. This mismatch triggers a false \"poor health\" or \"consider replacing\" flag. It is not a fault with the cell. Run one full discharge-to-hibernate followed by an uninterrupted charge to 100% and the BIOS learn cycle will rewrite that flag against the actual cell data.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eLaptop shuts down at 20–30% charge shown on screen\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis happens when the fuel gauge IC has not yet calibrated against the new cell's actual voltage curve. The OS fuel gauge still references the old cell's discharge profile, so it misreads remaining capacity. Under full CPU and display load, the new cell hits a voltage point the old profile maps to \"empty\" before the real cutoff. Run two full discharge-to-hibernate and full recharge cycles — after the second cycle the fuel gauge IC recalibrates and the shutdowns stop. If they persist past two cycles, check that the BIOS is not applying a custom low-battery threshold set above 20%.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43410820857946,"sku":"BWCS-LVK42NB-1","price":106.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43410820890714,"sku":"BWCS-LVK42NB-2","price":122.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43410820923482,"sku":"BWCS-LVK42NB-3","price":133.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-LVK42NB-1.webp?v=1779581257","url":"https:\/\/batteryweb.com\/products\/lenovo-k42-replacement-battery-111v-4400mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}