{"product_id":"oppo-r9-replacement-battery-38v-2850mah-li-polymer","title":"Oppo R9 BLP609 Replacement Battery 3.8V 2850mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eOppo R9 Series — 3.8V Li-Polymer Replacement Battery (BLP609)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThe BLP609 is a 3.8V, 2850mAh (10.83Wh) Li-Polymer cell for the Oppo R9, R9 Dual SIM, R9 Dual SIM TD-LTE 64GB, and R9tm. It replaces a degraded original cell when the phone can no longer hold charge, shuts down unexpectedly, or swells. Voltage and capacity match the original spec exactly.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eR9 series compatibility:\u003c\/strong\u003e\n    All R9 variants listed share the same battery bay dimensions, flex connector pinout, and BMS handshake protocol. The 83.20 × 64.20 × 3.60mm cell envelope fits all of them 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 R9 hardware, confirmed BMS communication, and verified the charge IC accepted the cell without thermal fault or premature cutoff.\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 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% after fitting the new cell\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis is a voltage cliff problem, not a capacity problem. Under modem transmission or screen-on load, current draw spikes and the new cell's voltage drops faster than the fuel gauge IC expects — the system interprets this as a dead battery and cuts power. The fuel gauge is still running its calibration against the old cell's discharge curve stored in firmware. One full discharge-charge cycle with fast charging off rewrites the curve and eliminates the false cutoff.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003ePhone won't power on after the replacement cell sat in storage\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eLi-Polymer cells in storage self-discharge below 2.5V per cell, which triggers BMS lockout to prevent damage. A phone in this state will show nothing on screen and won't respond to the power button. Connect it to a charger for at least 20–30 minutes before attempting to power it on — the charge IC needs to trickle-charge the cell back above the BMS re-enable threshold of approximately 2.8V before normal charging and startup can proceed.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43392095551578,"sku":"BWCS-OPR900SL-1","price":26.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43392095584346,"sku":"BWCS-OPR900SL-2","price":29.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43392095617114,"sku":"BWCS-OPR900SL-3","price":32.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-OPR900SL-1.webp?v=1779143764","url":"https:\/\/batteryweb.com\/products\/oppo-r9-replacement-battery-38v-2850mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}