{"product_id":"oppo-rmx1901-replacement-battery-385v-4000mah-li-polymer","title":"Oppo RMX1901 Compatible Battery BLP713 3.85V 4000mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eOppo RMX1901 \/ Realme X — 3.85V Li-Polymer Replacement Battery (BLP713)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThe BLP713 is the OEM-spec Li-Polymer cell for the Oppo RMX1901 and Realme X smartphones. It runs at 3.85V and delivers 4000mAh (15.4Wh) of capacity. This battery replaces the original when the phone can no longer hold a charge through normal daily use.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eRMX1901 and Realme X compatibility:\u003c\/strong\u003e\n    Both devices share the same motherboard platform, connector pinout, and BMS handshake protocol — one cell fits both without adaptation.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled the BLP713 through charge and discharge on the RMX1901 motherboard. The BMS accepted the cell, charge termination triggered at the correct 4.40V cutoff, and protection thresholds behaved within spec.\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. This lets the coulomb counter IC map its reference curve against the new cell before high-current VOOC charging pushes current into an uncalibrated state.\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% after swapping the BLP713\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThis happens because the fuel gauge IC still holds the discharge curve from the old, degraded cell. The new cell has a steeper voltage cliff under modem and display load than the IC expects. When voltage drops sharply at 20–30% reported charge, the IC interprets it as a cutoff event and shuts the phone down. One full discharge to 0% followed by an uninterrupted charge to 100% resets the coulomb counter and eliminates the false shutdown trigger.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eVOOC fast charge not activating on the first cycle after replacement\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eVOOC requires a handshake between the charger, the charge IC, and the battery BMS. On the first cycle with a new cell, the BMS may present higher internal impedance than the charge IC expects, causing it to fall back to standard 5V\/1A charging as a safety measure. This is not a fault with the battery or charger. Complete one full standard-current charge cycle — the charge IC will re-establish the VOOC handshake on subsequent connections once the cell impedance settles below the threshold.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43391995969626,"sku":"BWCS-OPX901SL-1","price":26.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43391996002394,"sku":"BWCS-OPX901SL-2","price":30.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43391996035162,"sku":"BWCS-OPX901SL-3","price":33.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-OPX901SL-1.webp?v=1779142856","url":"https:\/\/batteryweb.com\/products\/oppo-rmx1901-replacement-battery-385v-4000mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}