{"product_id":"oppo-reno4-pro-4g-replacement-battery-774v-2000mah-li-polymer","title":"BLP787 Oppo Reno4 Pro 4G Replacement Battery 7.74V 2000mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eOppo Reno4 Pro 4G \/ CPH2109 — 7.74V Li-Polymer Replacement Battery (BLP787)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 7.74V, 2000mAh Li-Polymer replacement battery for the Oppo Reno4 Pro 4G (CPH2109). It replaces OEM part BLP787 and fits directly into the Reno4 Pro 4G battery bay. When the original cell degrades — losing charge capacity or failing to hold voltage under load — this swap restores normal operation.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eReno4 Pro 4G \/ CPH2109 fit:\u003c\/strong\u003e\n    Both model designations share the same battery bay dimensions, connector pinout, and BMS handshake protocol. The BLP787 footprint at 86.75 × 61.55 × 4.70mm matches the original cell exactly — no bracket modifications needed.\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 and discharge cycles on a CPH2109 unit. The BMS accepted the new cell without error flags, and the fuel gauge IC tracked state-of-charge through the full voltage window from 8.7V down to the 6.0V cutoff.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst-cycle fast charge protocol:\u003c\/strong\u003e\n    On first use after installation, disable VOOC fast charging for one complete discharge-charge cycle. This lets the fuel gauge IC recalibrate its coulomb counter against the new cell's discharge curve before high-current charging pushes amperage 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 Reno4 Pro 4G after a cell swap\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe Reno4 Pro 4G uses a coulomb-counter fuel gauge that was calibrated to the original cell's discharge curve. After a cell swap, the counter still references the old curve — so when the new cell hits a voltage cliff under modem or screen load, the phone shuts down even though the reported percentage looks safe. The fix is one full discharge-to-cutoff followed by a full charge, with VOOC disabled. After that cycle, the fuel gauge IC maps the new cell's actual voltage curve and percentage reporting stabilises.\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\"\u003eOppo's VOOC protocol requires a handshake between the charge IC, BMS, and charger before high-current delivery begins. On a freshly installed cell, the BMS may not complete that handshake on the first cycle — the phone drops back to standard 5V\/1A charging instead. This is not a fault. Complete one full standard-charge cycle, allow the phone to reach 100% and sit for two minutes, then reconnect the VOOC charger. The handshake completes and fast charging activates at that point.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43391916736602,"sku":"BWCS-OPR410SL-1","price":30.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43391916769370,"sku":"BWCS-OPR410SL-2","price":34.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43391916802138,"sku":"BWCS-OPR410SL-3","price":37.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-OPR410SL-1.webp?v=1779142625","url":"https:\/\/batteryweb.com\/products\/oppo-reno4-pro-4g-replacement-battery-774v-2000mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}