{"product_id":"gigabyte-w476-replacement-battery-111v-4400mah-li-ion","title":"Gigabyte W476 Replacement Battery 11.1V 4400mAh SQU-805","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eGigabyte W476 \/ W576 Series — 11.1V Li-ion Replacement Battery (SQU-805)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 11.1V, 4400mAh (48.84Wh) Li-ion battery replaces the original cell in the Gigabyte W476, W576, Q1458, and Q1580 notebooks. It covers multiple OEM part numbers including SQU-804, SQU-807, SW8-3S4400-B1B1, and 3UR18650-2-T0188. Install it when the original pack no longer holds charge or the laptop refuses to run off battery alone.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eW476 \/ W576 \/ Q1458 \/ Q1580 platform fit:\u003c\/strong\u003e\n    These four models share the same 3S2P cell configuration, 11.1V nominal rail, and connector pinout, which is why one pack covers all four. The BMS communicates over the same SMBus protocol, so the BIOS reads charge state and temperature from this cell the same way it did from the original.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this pack through charge and discharge cycles on a W476 unit. The BMS balanced cells correctly, the BIOS recognised the pack without flags, and thermal cutoff triggered at the expected threshold under a CPU stress load.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003ePost-install calibration on the W476 BIOS:\u003c\/strong\u003e\n    After fitting this battery, run one full discharge to hibernate cutoff, then charge uninterrupted to 100% without unplugging. 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\"\u003eWhy the W476 reports \"poor battery health\" immediately after a new cell is fitted\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe W476 BIOS stores learned capacity data in EEPROM from the previous cell. When a new pack is installed, that stored data does not match the new cell's actual chemistry profile, so the BIOS flags health as poor or unknown. This is not a fault with the replacement battery. Running a full discharge-to-hibernate then a continuous charge-to-100% sequence forces the fuel gauge IC to rewrite its baseline. After one or two complete cycles, the health reading normalises and the warning clears.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eLaptop shuts off at 20–30% battery shown on the W576 and Q1458\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 voltage curve. The OS reads a percentage that doesn't reflect real cell voltage, and when actual voltage drops under full CPU and display load, the cell hits its lower cutoff before the OS expects it. The fix is the same calibration cycle — discharge fully to hibernate, charge to 100% without interruption. After two full cycles, the fuel gauge tracks the real voltage curve and shutdowns at low percentages stop. Confirm the pack is reading above 12.4V at full charge using a BIOS battery report or HWiNFO64.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43409822679130,"sku":"BWCS-FQU804NB-1","price":95.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43409822711898,"sku":"BWCS-FQU804NB-2","price":109.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43409822744666,"sku":"BWCS-FQU804NB-3","price":118.99,"currency_code":"USD","in_stock":true}],"url":"https:\/\/batteryweb.com\/products\/gigabyte-w476-replacement-battery-111v-4400mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}