{"product_id":"oppo-reno-4-4g-replacement-battery-387v-4400mah-li-polymer","title":"BLP853 Oppo Reno 4 4G Compatible Battery 3.87V 4400mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eOppo Reno 4 4G \/ Reno 5 Lite — 3.87V Li-Polymer Replacement Battery (BLP853)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.87V, 4400mAh (17.03Wh) lithium-polymer cell built to the BLP853 specification. It fits the Oppo Reno 4 4G (CPH2113) and Reno 5 Lite (CPH2205). The physical dimensions are 85.50 × 62.40 × 4.50mm — confirm these against your original cell before ordering.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eCPH2113 and CPH2205 compatibility:\u003c\/strong\u003e\n    Both handsets run the same 3.87V battery rail, share the BLP853 connector pinout, and use the same BMS handshake protocol. One cell covers both models 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 full charge and discharge on a CPH2113 unit. The BMS accepted the charge handshake cleanly, protection thresholds triggered correctly at low voltage, and no thermal anomalies appeared during the charge-to-full cycle.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration on first use:\u003c\/strong\u003e\n    Disable fast charging for the first complete discharge-charge cycle after installation. The fuel gauge IC in these Oppo devices calibrates its coulomb counter against the cell's discharge curve — fast charging before that baseline is set can produce skewed percentage readings for weeks.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the Reno 4 4G reports wrong battery percentage after a cell swap\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe fuel gauge IC stores a learned discharge curve from the old cell. When a new BLP853 cell goes in, that stored curve no longer matches the actual cell chemistry, so the reported percentage drifts — usually reading higher than reality. One complete slow charge-discharge cycle forces the coulomb counter to reset its baseline against the new cell. After that single calibration cycle, percentage accuracy returns to normal. Do not top up mid-cycle — let the phone drain to auto-shutdown, then charge uninterrupted to 100%.\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 fires a high-current draw and the cell cannot hold voltage above the BMS cutoff threshold — even though the gauge still shows charge remaining. It is a calibration problem, not a faulty cell. The BMS trips at roughly 3.0V per cell because the fuel gauge sent no warning. Run the recalibration cycle described above — one full drain to shutdown, one uninterrupted charge to 100%. If shutdowns persist past two full cycles, measure resting cell voltage with a multimeter; a healthy resting cell at 30% reported charge should sit above 3.6V.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43391840944218,"sku":"BWCS-OPR853SL-1","price":30.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43391840976986,"sku":"BWCS-OPR853SL-2","price":35.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43391841009754,"sku":"BWCS-OPR853SL-3","price":38.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-OPR853SL-1.webp?v=1779142387","url":"https:\/\/batteryweb.com\/products\/oppo-reno-4-4g-replacement-battery-387v-4400mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}