{"product_id":"fujitsu-lifebook-u937-replacement-battery-144v-3450mah-li-polymer","title":"Fujitsu LifeBook U937 CP730401-01 14.4V Replacement Battery","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eFujitsu LifeBook U937\/U938\/U939 — 14.4V Li-Polymer Replacement Battery (CP730401-01)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 14.4V, 3450mAh (49.68Wh) Li-Polymer battery for the Fujitsu LifeBook U937, U938, and U939 ultrabook series. It replaces OEM part numbers CP730401-01, CP737634-01, FPB0340S, and FPCBP536. Fit is confirmed against the slim 6.90mm profile and connector pinout common to this U-series chassis.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eU937\/U938\/U939 platform compatibility:\u003c\/strong\u003e\n    These three models share the same battery bay dimensions, connector layout, and BMS handshake protocol. Fujitsu used the same cell pack across the U-series refresh cycles, which is why multiple OEM part numbers cross-reference to a single physical unit.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell on a LifeBook U938 chassis and monitored BMS communication through the full charge cycle. The protection circuit responded correctly to charge termination at 16.8V and tripped as expected at the low-voltage cutoff under sustained CPU and display load.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003ePost-install calibration on LifeBook U-series:\u003c\/strong\u003e\n    After fitting this battery, run the unit down to hibernate cutoff — do not force a shutdown — then charge uninterrupted to 100%. This 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 fitting a new cell\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe LifeBook U-series BIOS reads EEPROM data written by the original cell during its operational life. When a new cell goes in, that stored cycle count and capacity history no longer matches the fresh chemistry, so the BIOS flags the battery as degraded. This is a data mismatch, not a fault with the replacement. Run a full discharge-to-hibernate followed by a complete uninterrupted charge to 100%. After two to three full cycles, the fuel gauge IC recalibrates against the new cell and the health warning clears.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eLaptop shuts down at 20–30% charge shown on the battery meter\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis happens when the cell voltage drops sharply under combined CPU and display load before the OS fuel gauge has caught up. The BMS trips at its low-voltage floor — typically around 12.0V under load — while the software still shows 20–30% remaining. The gauge is reading a resting voltage curve that no longer matches actual load behaviour on a new cell. Run three full discharge and recharge cycles to let the fuel gauge IC map the new cell's actual voltage-to-capacity curve and the early shutdowns will stop.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43409566793818,"sku":"BWCS-FUK938NB-1","price":108.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43409566826586,"sku":"BWCS-FUK938NB-2","price":128.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43409566859354,"sku":"BWCS-FUK938NB-3","price":142.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-FUK938NB-1.webp?v=1779580012","url":"https:\/\/batteryweb.com\/products\/fujitsu-lifebook-u937-replacement-battery-144v-3450mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}