{"product_id":"fujitsu-sw8-replacement-battery-111v-4400mah-li-ion","title":"Fujitsu SQU-805 LifeBook SW8 Replacement Battery 11.1V 4400mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eFujitsu SW8 \/ TW8 — 11.1V Li-ion Replacement Battery (SQU-805)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 11.1V, 4400mAh Li-ion battery replaces the original cell in the Fujitsu LifeBook SW8 and TW8 notebooks. It cross-references OEM part numbers SQU-804, SQU-805, SQU-807, SW8-3S4400-B1B1, and several others listed above. Slot it in and the laptop runs on battery power as it did from day one.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eSW8 and TW8 shared battery platform:\u003c\/strong\u003e\n    Both models use the same 3-cell 11.1V architecture, identical connector pinout, and the same BMS handshake protocol — which is why a single part number covers both. Swapping between a SW8 and TW8 unit produces no recognition errors at the firmware level.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell on a SW8 unit and monitored the BMS through full charge and a load discharge cycle. The protection circuit responded correctly to over-charge, over-discharge, and short-circuit triggers. The BIOS detected the battery without driver prompts.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst-cycle calibration on the SW8:\u003c\/strong\u003e\n    After installing, run one full discharge to the hibernate cut-off point, then charge uninterrupted to 100%. This single learn cycle resets the BIOS battery counter against the new cell 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\n  \u003cp class=\"bpw-desc-p\"\u003eThe SW8 BIOS stores charge history and wear data in EEPROM tied to the old cell. When a new battery is installed, that stored data does not match the fresh cell's actual state, so the system flags the battery as degraded. This is a data mismatch, not a fault with the replacement. Running one complete discharge-to-hibernate followed by a full uninterrupted charge resets the learn cycle. After that single cycle, the BIOS health reading aligns with the new cell's actual capacity.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eLifeBook SW8 shutting down abruptly at 20–30% charge shown\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis is a voltage cliff symptom. When the combined CPU and display load draws peak current, a weakened or uncalibrated cell drops below the BMS cutoff voltage before the fuel gauge IC reaches zero — the system cuts power with charge still displayed on screen. On a new replacement cell, this usually means the fuel gauge IC has not yet calibrated against the new chemistry. Complete two full discharge-to-hibernate and charge-to-100% cycles. If the shutdowns continue past three cycles, check the BIOS battery page for a reported voltage below 10.8V under load.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43409823367258,"sku":"BWCS-FQU804NB-1","price":95.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43409823400026,"sku":"BWCS-FQU804NB-2","price":109.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43409823432794,"sku":"BWCS-FQU804NB-3","price":118.99,"currency_code":"USD","in_stock":true}],"url":"https:\/\/batteryweb.com\/products\/fujitsu-sw8-replacement-battery-111v-4400mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}