{"product_id":"blu-g80-replacement-battery-385v-3800mah-li-polymer","title":"BLU G80 Replacement Battery C706342400P 3.85V 3800mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eBLU G80 — 3.85V Li-Polymer Replacement Battery (C706342400P)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3800mAh, 3.85V Li-Polymer battery for the BLU G80 and G0290ww smartphones. It replaces OEM part C706342400P when the original cell has degraded, swells, or no longer holds a usable charge. Physical dimensions are 80.30 × 61.20 × 4.60mm — verify clearance before installation.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eG80 and G0290ww compatibility:\u003c\/strong\u003e\n    Both models share the same PCB connector pinout, voltage rail, and BMS handshake protocol. One cell fits both variants without modification.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell through charge and discharge on a G80 unit. The BMS accepted the cell on first connection, thermal protection triggered correctly at load, and the coulomb counter tracked state-of-charge without fault codes.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration on first use:\u003c\/strong\u003e\n    After installation, disable fast charging and run one complete discharge-to-charge cycle at standard current. The fuel gauge IC maps its calibration curve against the new cell's discharge profile before fast charging pushes high current into an uncalibrated reference point.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eSudden shutdown at 20–30% on the BLU G80 after a cell swap\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis happens because the fuel gauge IC still holds the discharge curve from the old, degraded cell. When the new cell hits a voltage point the old curve mapped as 20–30%, the IC signals low-battery shutdown even though actual capacity remains. The phone cuts power before the new cell is genuinely depleted. One full discharge-then-charge cycle forces the coulomb counter to rebuild its reference against the new cell and corrects the early-shutdown behaviour.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eUSB fast charge not activating on the first cycle after replacement\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eOn first connection to a fast charger, the charge IC may default to standard 5V\/1A input until it confirms the new cell's impedance is within protocol limits. This is a protective handshake, not a fault. Let the phone complete one full charge at standard rate. On the second cycle, the charge IC re-evaluates cell impedance and fast charging resumes — confirm by checking the charging indicator or pulling battery stats at 3.85V nominal.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43391878561882,"sku":"BWCS-BLG800SL-1","price":26.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43391878594650,"sku":"BWCS-BLG800SL-2","price":30.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43391878627418,"sku":"BWCS-BLG800SL-3","price":33.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-BLG800SL-1.webp?v=1779142479","url":"https:\/\/batteryweb.com\/products\/blu-g80-replacement-battery-385v-3800mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}