Oppo BLP701 Reno Replacement Battery 3.85V 3650mAh

Oppo Reno CPH1917 — 3.85V Li-Polymer Replacement Battery (BLP701)

This is a 3.85V, 3650mAh lithium-polymer cell that replaces the original BLP701 battery in the Oppo Reno (CPH1917 / PCAM00). It fits the standard battery compartment and connects to the same flex cable and charge IC as the factory unit. Swap this in when the original cell no longer holds adequate charge or the phone shuts down unexpectedly.

• CPH1917 and PCAM00 compatibility: Both model codes reference the same Reno hardware platform — same voltage rail, same BLP701 connector pitch, and the same BMS handshake protocol. One cell covers both variants.
• Bench tested on actual hardware: We ran the BLP701 replacement through a full charge cycle on the Reno platform. The charge IC accepted the cell without rejection flags, and the BMS engaged charge termination correctly at capacity.
• Fuel gauge recalibration on first use: After installation, disable VOOC fast charging and run one complete discharge-to-charge cycle on standard 5W input. This lets the fuel gauge IC map the new cell's actual discharge curve before fast charge pushes high current into an uncalibrated cell.

Why the Reno reports wrong battery percentage after a cell swap

The Reno uses a coulomb counter IC that builds its capacity model against the original cell's discharge curve. When a new cell goes in, the stored curve no longer matches the actual cell chemistry, so the reported percentage drifts — often reading high early in discharge and then dropping fast near the bottom. This is not a fault in the replacement cell. One full discharge cycle from 100% down to automatic shutdown, followed by a full uninterrupted charge, forces the IC to rebuild its curve against the new cell. After that cycle, percentage readings stabilise.

Sudden shutdown at 20–30% on the replacement cell

This happens when the fuel gauge IC has not yet recalibrated and the phone's low-voltage cutoff triggers earlier than the displayed percentage suggests. Under modem or display load, cell voltage drops faster than the uncalibrated counter expects — the BMS sees the voltage floor and cuts power while the screen still shows 25%. Run the recalibration cycle described above first. If shutdowns continue after two full cycles, check that the battery flex cable is fully seated — a partially connected cell introduces resistance that accelerates voltage sag under load, triggering cutoff at a higher state of charge. Reseat the connector and confirm it clicks flat before closing the chassis.