{"product_id":"oppo-9-5g-2022-replacement-battery-387v-4500mah-li-polymer","title":"Oppo BLP909 Reno9 5G Replacement Battery 3.87V 4500mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eOppo Reno 9 5G \/ Realme 9 — 3.87V Li-Polymer Replacement Battery (BLP909)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.87V, 4500mAh (17.42Wh) lithium-polymer cell for the Oppo Reno 9 5G (2022), RMX3474, and Realme 9 smartphones. It replaces OEM part BLP909. The cell dimensions are 92.10 × 64.50 × 4.50mm, matching the original housing footprint.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eReno 9 5G and Realme 9 compatibility:\u003c\/strong\u003e\n    Both devices share the BLP909 cell spec — same voltage rail, same connector pinout, and the same BMS handshake protocol. One cell covers all three model variants listed.\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 RMX3474 hardware. The BMS accepted the cell, charge IC ramped correctly, and no protection trips were logged during load testing.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst-cycle fast charge caution:\u003c\/strong\u003e\n    After installation, disable fast charging and run one complete discharge-to-charge cycle at standard rate. This lets the fuel gauge IC recalibrate against the new cell's discharge curve before high-current fast 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 replacement cell\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis is a voltage cliff issue, not a capacity fault. Under peak modem load or display brightness, the cell voltage drops faster than the fuel gauge IC expects, crossing the BMS cutoff threshold before the percentage reaches zero. The gauge IC is still calibrated to the old cell's discharge curve from the previous battery. Run one full discharge from 100% to automatic shutdown, then charge uninterrupted to 100% — after that cycle, the coulomb counter resets against the new cell and the shutdowns stop.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eOS percentage jumping erratically after cell swap\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe fuel gauge IC stores a learned discharge curve from the original cell. When a new cell goes in, the stored curve no longer matches actual cell voltage at each state-of-charge point. The result is percentage readings that jump — often 10–15% in either direction — with no warning. One complete, uninterrupted discharge-charge cycle at standard rate (fast charge off) forces the coulomb counter to relearn the curve. After that cycle, percentage reporting stabilises to within ±2–3%.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43391787827290,"sku":"BWCS-OPR347SL-1","price":40.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43391787860058,"sku":"BWCS-OPR347SL-2","price":47.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43391787892826,"sku":"BWCS-OPR347SL-3","price":52.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-OPR347SL-1.webp?v=1779142036","url":"https:\/\/batteryweb.com\/products\/oppo-9-5g-2022-replacement-battery-387v-4500mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}