{"product_id":"lenovo-thinkpad-l14-gen-4intel21h10063ed-replacement-battery-1152v-4850mah-li-polymer","title":"Lenovo ThinkPad L14 Gen 4 Compatible Battery 11.52V 4850mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eLenovo ThinkPad L14 Gen 4 \/ L15 Gen 3 — 11.52V Li-Polymer Replacement Battery (5B11F21941)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is an 11.52V, 4850mAh (55.87Wh) Li-Polymer battery for the Lenovo ThinkPad L14 Gen 4 and L15 Gen 3 series laptops. It replaces OEM part numbers including 5B11F21941, L21C3PG2, L21M3PG2, and related variants. The battery fits both Intel and AMD platform variants across these two ThinkPad generations.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eL14 Gen 4 and L15 Gen 3 shared battery platform:\u003c\/strong\u003e\n    Both the Intel and AMD variants of these ThinkPad generations use the same 11.52V three-cell Li-Polymer pack with a common connector pinout and BMS communication protocol. Lenovo standardised the battery bay across both CPU platforms in these generations, so one SKU covers the full model spread.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell through charge and discharge cycles on a ThinkPad L14 Gen 4. The BMS handshake completed correctly, the BIOS registered the battery as present, and the fuel gauge began tracking charge state from the first cycle.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBIOS learn cycle after installation:\u003c\/strong\u003e\n    After fitting this battery, run the laptop on battery power down to hibernate-level 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 — the warning reflects EEPROM data from the old cell, not the new one.\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\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe ThinkPad BIOS reads health state from EEPROM data embedded in the battery pack, not from live cell measurements. When a new cell is installed, the BIOS compares the new pack's cycle count and charge history against its stored baseline — which still references the old battery. This mismatch causes the BIOS to flag \"poor health\" even on a fresh cell. Running one complete discharge-to-hibernate then a full uninterrupted charge to 100% rewrites the baseline and clears the warning.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eLaptop shutting down at 20–30% shown after battery swap\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 discharge curve. The gauge was mapped to the old cell's voltage profile, so it misreads the new cell's voltage cliff and triggers shutdown well before the cell is genuinely empty. The fix is two to three full discharge and charge cycles — each cycle tightens the gauge's model of the new cell. After the third cycle, the reported percentage at shutdown should track within a few percent of actual remaining charge.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43409644617818,"sku":"BWCS-LVL144NB-1","price":98.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43409644650586,"sku":"BWCS-LVL144NB-2","price":116.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43409644683354,"sku":"BWCS-LVL144NB-3","price":129.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-LVL144NB_1.webp?v=1779579986","url":"https:\/\/batteryweb.com\/products\/lenovo-thinkpad-l14-gen-4intel21h10063ed-replacement-battery-1152v-4850mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}