Oppo Reno7 SE 5G BLP895 Replacement Battery 3.87V 4400mAh

Oppo Reno7 SE 5G — 3.87V Li-Polymer Replacement Battery (BLP895)

This is a 3.87V, 4400mAh lithium-polymer cell for the Oppo Reno7 SE 5G and PFCM00 variant. It replaces part number BLP895. Fit this cell when the original no longer holds charge through a standard day of use or fails to power the phone at all.

• Reno7 SE 5G and PFCM00 compatibility: Both the Reno7 SE 5G and PFCM00 share the same mainboard connector, BMS communication pinout, and 3.87V nominal charge rail — so a single BLP895-spec cell covers both variants without modification.
• Bench tested on actual hardware: We cycled this cell through full charge and discharge runs on the Reno7 SE 5G platform. The BMS handshake completed correctly, charge IC accepted the cell without rejection flags, and coulomb counter initialised within the first cycle.
• Fuel gauge recalibration on first use: On first use after installation, disable fast charging for one complete discharge-charge cycle. This lets the fuel gauge IC build an accurate discharge curve against the new cell before high-current charging begins on an uncalibrated counter.

Sudden shutdown at 20–30% on the Reno7 SE 5G after a cell swap

This is a voltage cliff problem, not a capacity problem. The fuel gauge IC still holds calibration data from the old degraded cell, so the percentage readout no longer maps to the new cell's actual voltage curve. Under modem load or screen brightness spikes, the new cell's voltage drops momentarily below the BMS cutoff threshold — around 3.2V — while the gauge still reads 25%. One full discharge-charge cycle with fast charging disabled resets the coulomb counter and resolves most shutdowns.

USB fast charging not activating on the first cycle after replacement

Oppo's VOOC and the USB-PD negotiation layer both require the charge IC to confirm cell impedance before stepping up current. On a brand-new cell, initial impedance reads slightly higher than a conditioned cell, and the charge IC may default to standard 5V/1A as a precaution. This is not a fault with the cell or the charger. Run one full standard-rate charge cycle first — after that, the IC recalibrates impedance and fast charging activates normally on subsequent cycles.