{"product_id":"oppo-realme-5-pro-replacement-battery-385v-3900mah-li-polymer","title":"Oppo Realme 5 Pro BLP731 Compatible Battery 3.85V 3900mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eOppo Realme 5 Pro \/ RMX1971 — 3.85V Li-Polymer Replacement Battery (BLP731)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.85V, 3900mAh (15.02Wh) Li-Polymer cell built to the BLP731 specification for the Realme 5 Pro (RMX1971). It replaces the original battery when capacity fade makes the phone unreliable through a normal day. Voltage, connector, and BMS communication match the factory cell.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eRealme 5 Pro \/ RMX1971 fitment:\u003c\/strong\u003e\n    Both model designations share the same battery bay dimensions, connector pinout, and BMS handshake protocol. The BLP731 cell covers both — no adapter or modification needed.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran the BLP731 through charge and discharge cycles on the RMX1971 board. The BMS accepted the cell without fault flags, and the charge IC stepped through VOOC pre-charge, CC, and CV phases as expected.\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 and run one full discharge-charge cycle on standard 5W. This gives the fuel gauge IC one complete sweep of the new cell's discharge curve before high-current VOOC charging pushes 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 5 Pro after a cell swap\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe Realme 5 Pro's fuel gauge IC holds a discharge curve from the original cell in its coulomb counter. When a new cell goes in, the stored curve no longer matches the actual voltage drop profile of the fresh Li-Polymer cell. Under peak load — modem transmit or screen at full brightness — the phone hits a voltage point it incorrectly reads as critically low and shuts down, even with usable capacity remaining. One full discharge to automatic power-off, followed by a complete charge to 100%, resets the coulomb counter against the new cell. After that cycle, the percentage reporting stabilises.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eVOOC fast charge not activating after BLP731 installation\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eRealme's VOOC protocol requires a handshake between the charger, the charge IC on the board, and the battery BMS before elevated current is allowed. On the first cycle with a new cell, the BMS may not complete that handshake, so the phone falls back to standard 5W charging. This is not a fault — it clears after one standard charge cycle at 5V\/1A. If VOOC still does not activate on the second cycle, check that the original VOOC adapter is in use, since third-party chargers do not carry the protocol regardless of cable quality.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43391985746010,"sku":"BWCS-OPX971SL-1","price":26.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43391985778778,"sku":"BWCS-OPX971SL-2","price":29.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43391985811546,"sku":"BWCS-OPX971SL-3","price":32.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-OPX971SL-1.webp?v=1779142738","url":"https:\/\/batteryweb.com\/products\/oppo-realme-5-pro-replacement-battery-385v-3900mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}