{"product_id":"oppo-a15-replacement-battery-385v-4150mah-li-polymer","title":"Oppo A15 BLP817 Replacement Battery 3.85V 4150mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eOppo A15 \/ CPH2185 — 3.85V Li-Polymer Replacement Battery (BLP817)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.85V, 4150mAh (15.98Wh) lithium-polymer cell replacing the OEM BLP817 battery in the Oppo A15 and A15S smartphones. It fits the CPH2185 model code and the A15 2020 variant. The connector, dimensions (88.00 × 64.15 × 4.00mm), and BMS pinout match the original factory specification.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eA15 and A15S platform compatibility:\u003c\/strong\u003e\n    Both the A15 and A15S share the CPH2185 platform chassis, the same fuel gauge IC wiring, and the identical BLP817 connector layout — one cell covers both handsets without modification.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell on a CPH2185 unit and confirmed the BMS handshake completes at first boot, the fuel gauge IC accepts the new cell, and charge termination triggers correctly at 4.35V.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst-cycle fast charge handling:\u003c\/strong\u003e\n    On first use after installation, disable VOOC or fast charging for one full discharge-charge cycle. This lets the fuel gauge IC build an accurate discharge curve for the new cell before high-current charging is applied to an uncalibrated pack.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the A15 reports wrong battery percentage after a cell swap\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe A15 uses a coulomb counter IC that builds its reference model against the original cell's discharge curve. When you install a new BLP817 cell, the IC still references the old degraded curve. This causes the reported percentage to be 10–20% off real capacity for the first few cycles. Run one complete discharge to the automatic shutdown point and charge to 100% without interruption — the IC resets its full-charge reference and the readings stabilise.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eSudden shutdown at 20–30% remaining on the replacement cell\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis happens when the modem or display draws a high current spike and the cell voltage drops below the BMS cutoff threshold before the fuel gauge IC registers the drop. On a freshly installed cell, the IC's low-voltage floor reference is still calibrated to the old cell's internal resistance. The BMS sees the voltage cliff first and cuts power while the OS is still showing 25%. After two full discharge-charge cycles, the IC recalibrates its voltage-to-capacity mapping and the early shutdowns stop.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43391897632858,"sku":"BWCS-OPA150SL-1","price":26.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43391897665626,"sku":"BWCS-OPA150SL-2","price":29.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43391897698394,"sku":"BWCS-OPA150SL-3","price":32.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-OPA150SL-1.webp?v=1779142625","url":"https:\/\/batteryweb.com\/products\/oppo-a15-replacement-battery-385v-4150mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}