{"product_id":"xolo-q800-replacement-battery-37v-2300mah-li-polymer","title":"BL-G021A Xolo Q800 Compatible Battery 3.7V 2300mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eXolo Q800 — 3.7V Li-Polymer Replacement Battery (BL-G021A)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V, 2300mAh Li-Polymer replacement battery for the Xolo Q800 smartphone. It fits the Q800 directly and uses OEM part number BL-G021A as the reference match. Capacity is rated at 8.51Wh and dimensions are 71.50 × 58.53 × 4.60 mm.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eQ800 fitment:\u003c\/strong\u003e\n    The Q800 uses a removable Li-Polymer cell behind the rear cover. The BL-G021A form factor matches the battery bay dimensions and connector orientation. No modification is needed to seat this cell.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell through full charge and discharge on the Q800 platform. The BMS handshake completed normally and the charge IC accepted current without flagging errors.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration on first use:\u003c\/strong\u003e\n    On first use after installation, disable fast charging if your Q800 supports it and complete one full discharge-charge cycle. This lets the fuel gauge IC map the new cell's discharge curve before the OS begins reporting percentage accurately.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the Q800 reports wrong battery percentage after a cell swap\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe Q800 uses a fuel gauge IC that tracks charge by counting coulombs against a stored discharge curve from the original cell. When you install a new cell, that stored curve no longer matches the actual cell chemistry. The IC will report percentages that drift high or low until it builds a new reference. One complete discharge to auto-shutdown followed by a full uninterrupted charge corrects this — after that cycle, the reported percentage tracks the actual cell state accurately.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eSudden shutdown at 20–30% on the replacement cell\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis happens when the modem or display pulls a current spike the cell cannot sustain at that state of charge, and voltage drops below the BMS cutoff threshold momentarily. It is not a defective cell — it is an uncalibrated fuel gauge cutting power at the wrong point. Run one full discharge cycle to let the IC establish the true low-voltage floor. If shutdown continues after two calibration cycles, measure resting cell voltage with a multimeter — it should read above 3.6V at 20% reported charge.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43404152766554,"sku":"BWCS-GNN800SL-1","price":24.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43404152799322,"sku":"BWCS-GNN800SL-2","price":27.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43404152832090,"sku":"BWCS-GNN800SL-3","price":30.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-GNN800SL-1.webp?v=1779369080","url":"https:\/\/batteryweb.com\/products\/xolo-q800-replacement-battery-37v-2300mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}