{"product_id":"oppo-r9s-replacement-battery-385v-3000mah-li-polymer","title":"Oppo BLP621 R9s Replacement Battery 3.85V 3000mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eOppo R9s \/ CPH1607 — 3.85V Li-Polymer Replacement Battery (BLP621)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3000mAh, 3.85V Li-Polymer cell built to the BLP621 specification for the Oppo R9s and R9s Dual SIM variants, including CPH1607. It fits the 2016 5.5-inch R9s lineup directly, restoring capacity when the original cell has degraded or failed. Install requires removing the rear cover and disconnecting the original flex connector.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eR9s and CPH1607 variant fit:\u003c\/strong\u003e\n    The R9s, R9s Dual SIM, and R9s Dual SIM TD-LTE all share the same battery bay geometry, connector pinout, and BMS handshake protocol — which is why a single BLP621 cell covers the entire lineup 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 charge and discharge on R9s hardware. The BMS accepted the cell, balancing terminated correctly at 4.35V, and protection cutoff triggered as expected at the low-voltage threshold.\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 VOOC fast charging for one complete discharge-charge cycle. This lets the fuel gauge IC map its coulomb counter against the new cell's actual discharge curve before high-current charging begins on 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 R9s after a cell swap\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThis is a voltage-cliff failure, not a capacity problem. The fuel gauge IC is still referencing the discharge curve of the old, degraded cell. When the new cell hits a load spike — modem handoff, screen brightness jump, or GPS — the voltage briefly sags below the SoC estimate the IC is using, triggering an emergency shutdown. The fix is one full discharge-to-cutoff and charge-to-4.35V cycle without interruption. After that cycle, the coulomb counter recalibrates to the new cell's actual curve and the shutdowns stop.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eVOOC fast charge not activating after BLP621 installation\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eOppo's VOOC protocol requires a handshake between the charger adapter, the charge IC on the board, and the battery's internal BMS. On the first cycle after a cell swap, the BMS has not yet completed its initialisation sequence, so the charge IC defaults to standard 5V\/1A input and VOOC never negotiates. Plug in the original Oppo VOOC adapter and let the first charge complete fully without unplugging mid-cycle. On the second charge, the VOOC handshake re-establishes and the adapter switches to high-current mode as normal.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43392082149466,"sku":"BWCS-OPA912XL-1","price":26.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43392082182234,"sku":"BWCS-OPA912XL-2","price":29.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43392082215002,"sku":"BWCS-OPA912XL-3","price":32.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-OPA912XL-1.webp?v=1779143639","url":"https:\/\/batteryweb.com\/products\/oppo-r9s-replacement-battery-385v-3000mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}