About this replacement
Oppo Reno 7 Pro 5G — 7.74V Li-Polymer Replacement Battery (BLP905)
This is a 7.74V, 2200mAh Li-Polymer replacement battery carrying OEM part number BLP905. It fits the Oppo Reno 7 Pro 5G, Reno 7 Pro 5G 2021, Reno 7 Pro 5G 2021 Standard Edition, and PFDM00 variants. Swap it in when the original cell no longer holds a charge, drains unusually fast, or causes the phone to shut down unexpectedly.
- Reno 7 Pro 5G platform fit: The PFDM00 board shares the same 7.74V dual-cell Li-Polymer rail and BLP905 connector footprint across all regional Reno 7 Pro 5G variants. The BMS handshake and pin-out are consistent across the 2021 and Standard Edition builds, so one cell covers the full lineup.
- Bench tested on actual hardware: We cycled BLP905 cells through charge and discharge on the Reno 7 Pro 5G board. The BMS accepted the cell without fault codes, and the charge IC stepped through its CC/CV curve cleanly from the first cycle.
- First-cycle fast charge behaviour: On first use after installation, disable SUPERVOOC fast charging for one complete discharge-charge cycle. This lets the fuel gauge IC recalibrate its coulomb counter against the new cell's discharge curve before high-current charging begins on an uncalibrated reference.
Sudden shutdown at 20–30% on the BLP905 replacement cell
After a cell swap, the fuel gauge IC still holds the old cell's discharge curve in memory. When the modem fires up a 5G radio burst or the display peaks brightness, the new cell's internal resistance causes a brief voltage sag. The gauge reads that sag as critically low and triggers an emergency shutdown — even though the cell still has charge. One full discharge-charge cycle with SUPERVOOC off forces the coulomb counter to map the new cell's actual voltage floor. After that cycle, the shutdowns stop.
OS reporting wrong battery percentage after a cell swap
ColorOS reads battery percentage from the fuel gauge IC's stored discharge model, not directly from cell voltage. That model was built around the worn original cell, so it misreads the new BLP905 capacity and shows jumpy or inaccurate figures. Drain the phone to automatic shutdown, then charge uninterrupted to 100% with fast charging off. That single full cycle resets the coulomb counter to the correct reference points for the new cell.