{"product_id":"lenovo-thinkbook-14-g4-iap-21cx000hre-replacement-battery-1552v-3850mah-li-polymer","title":"Lenovo ThinkBook 14 G4 Replacement Battery L21C4PD6 15.52V","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eLenovo ThinkBook 14 G4 IAP — 15.52V Li-Polymer Replacement Battery (L21C4PD6)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 15.52V, 3850mAh (59.75Wh) Li-Polymer battery for the Lenovo ThinkBook 14 G4 IAP series. It fits models including the 21CX000HRE, 21CX001NRM, 21CX004DAK, and 21CX000EAT among 136+ variants. It replaces OEM part numbers L21C4PD6, L21D4PD6, L21L4PD6, L21M4PD6, and SB11E40205.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eThinkBook 14 G4 IAP compatibility:\u003c\/strong\u003e\n    All 21CX-series variants share the same 15.52V four-cell Li-Polymer architecture, connector pinout, and BMS handshake protocol. That consistent platform spec is why a single cell replacement covers the full production run of this generation.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell on a ThinkBook 14 G4 IAP chassis. The BMS initialised cleanly, charge accepted across all four cells without balancing errors, and the pack reached full voltage without triggering a protection cutoff.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003ePost-install discharge cycle on ThinkBook 14 G4 IAP:\u003c\/strong\u003e\n    After fitting this cell, run a full discharge to hibernate cutoff, then charge uninterrupted to 100%. This resets the BIOS battery learn cycle and clears the inaccurate health warning that appears in Lenovo Vantage 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 poor battery health immediately after replacement\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe ThinkBook 14 G4 IAP stores battery health data in EEPROM on the original cell. When a new cell goes in, the BIOS reads a blank or mismatched EEPROM and flags the battery as degraded or unknown. This is not a fault with the replacement cell — it is stale data from the previous pack. Running the Lenovo battery learn cycle through Lenovo Vantage, or completing one full discharge-to-hibernate then a full uninterrupted charge, allows the firmware to rewrite that EEPROM data against the new cell's actual capacity curve.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eLaptop 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 has not yet calibrated to the new cell's voltage-to-capacity curve. The gauge predicts remaining charge based on the old cell's profile, so it under-reports how far down the voltage has actually dropped. Under combined CPU and display load, the cell hits its real low-voltage cutoff before the OS gauge reaches 0%. Complete two full discharge-to-hibernate cycles followed by uninterrupted charges to 100%. After those calibration passes, the fuel gauge tracks actual cell voltage accurately and the early shutdowns stop.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43409547559002,"sku":"BWCS-LVB142NB-1","price":98.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43409547591770,"sku":"BWCS-LVB142NB-2","price":116.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43409547624538,"sku":"BWCS-LVB142NB-3","price":129.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-LVB142NB-1.webp?v=1779579986","url":"https:\/\/batteryweb.com\/products\/lenovo-thinkbook-14-g4-iap-21cx000hre-replacement-battery-1552v-3850mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}