About this replacement
Oppo Reno6 Pro / Reno5 Pro+ — 7.74V Li-Polymer Replacement Battery (BLP825)
This is a 7.74V, 2200mAh Li-Polymer replacement battery for the Oppo Reno6 Pro and Reno5 Pro+. It replaces OEM part number BLP825 and fits the original battery bay without modification. Voltage and cell dimensions match the factory spec at 83.64 x 61.45 x 5.50mm.
- Reno6 Pro and Reno5 Pro+ compatibility: Both devices share the BLP825 form factor, connector pinout, and BMS handshake protocol. The fuel gauge IC on both platforms reads the same cell voltage curve, so one cell fits both without firmware conflict.
- Bench tested on actual hardware: We cycled this cell through full charge and discharge passes on the Reno6 Pro. The BMS accepted the cell on first connection, charge termination triggered correctly at 8.68V, and the coulomb counter tracked state-of-charge without fault flags.
- 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 discharge curve against the new cell before high-current fast charging pushes amperage into an uncalibrated state-of-charge map.
Sudden shutdown at 20–30% on the replacement cell
This is a voltage cliff issue, not a capacity problem. Under high-load conditions — modem handoffs, sustained screen brightness, or background sync — the cell's instantaneous voltage drops below the BMS cutoff threshold before the coulomb counter reaches zero. The fuel gauge IC is still calibrated to the old cell's internal resistance profile, so it reports 25% while the actual usable voltage has already collapsed. Run one full discharge to automatic shutdown and a full uninterrupted charge to resolve it — the coulomb counter resets its endpoint references against the new cell's curve.
SUPERVOOC fast charge not activating after battery replacement
Oppo's SUPERVOOC protocol requires the charger IC to complete a BMS handshake before it will step voltage above standard 5V input. On a freshly installed cell, the BMS may return an unexpected impedance reading on the first negotiation cycle, causing the charger IC to fall back to standard charging rates. This is not a fault — it resolves after one standard-rate charge cycle re-establishes the reference baseline. If fast charge still does not activate after that cycle, check that the USB-C port contacts are clean and the cable supports the required current rating.