{"product_id":"oppo-realme-8-replacement-battery-385v-4850mah-li-polymer","title":"BLP841 Oppo Realme 8 Replacement Battery 3.85V 4850mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eOppo Realme 8 \/ Realme Q3 Series — 3.85V Li-Polymer Replacement Battery (BLP841)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.85V, 4850mAh (18.67Wh) Li-Polymer replacement battery for the Oppo Realme 8, Realme Q3, Realme Q3I, and RMX3085. It fits directly where the OEM BLP841 cell sits. Swap it when the original cell no longer holds charge, swells, or causes unexpected shutdowns.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eRealme 8 and Q3 platform compatibility:\u003c\/strong\u003e\n    The Realme 8, Q3, and Q3I share the same battery bay geometry, connector pinout, and BMS communication protocol — all three accept the BLP841 cell without modification to the charge circuit or connector housing.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell through full charge-discharge cycles on Realme 8 hardware. The BMS handshake completed correctly, charge current stepped down at the expected cutoff threshold, and the fuel gauge IC accepted the cell without throwing a battery health warning in settings.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst-cycle fuel gauge reset on the Realme 8:\u003c\/strong\u003e\n    On first use after installation, disable fast charging and run one complete discharge-charge cycle on standard 10W charging. This lets the fuel gauge IC map the new cell's discharge curve before high-current fast charging pushes significant current into an uncalibrated cell.\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 Realme 8 after a cell swap\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eA fresh cell with a factory-set discharge curve will not match the coulomb counter data stored from the degraded original. The fuel gauge IC reads percentage against an old reference table, so it reports 25% when the cell voltage has already dropped below what the processor and modem can sustain under load. The result is an abrupt shutdown — not a drained battery. One full discharge to 3.2V and a complete charge to 4.35V recalibrates the counter against the actual new cell curve.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eVOOC or fast charge not activating on the first charge cycle after replacement\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eOppo's proprietary fast charge protocol includes a handshake between the charger, the phone's charge IC, and the battery BMS. On a first cycle with a new cell, the charge IC defaults to standard 5V\/2A input until it confirms BMS parameters are within spec. This is normal protective behaviour, not a fault with the battery or charger. Complete one full standard charge cycle first — fast charging typically activates automatically from the second cycle onward once the BMS has confirmed cell impedance is within the expected range.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43391878332506,"sku":"BWCS-OPR810SL-1","price":30.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43391878365274,"sku":"BWCS-OPR810SL-2","price":35.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43391878398042,"sku":"BWCS-OPR810SL-3","price":38.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-OPR810SL-1.webp?v=1779142480","url":"https:\/\/batteryweb.com\/products\/oppo-realme-8-replacement-battery-385v-4850mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}