BLP727 Oppo A11x Compatible Battery 3.85V 4900mAh

Oppo A11x / PCHT00 / PCHM00 — 3.85V Li-Polymer Replacement Battery (BLP727)

The BLP727 is the original-spec Li-Polymer cell for the Oppo A11x (PCHT00, PCHM00). It runs at 3.85V and delivers 4900mAh (18.87Wh). If your A11x shuts down early, swells, or no longer holds a charge, this is the direct cell replacement.

• A11x platform fit — PCHT00 and PCHM00: Both model codes share the same battery bay geometry, connector pinout, and BMS handshake protocol. The BLP727 part number covers all three variants without modification.
• Bench tested on actual hardware: We ran this cell through charge and discharge cycles on a calibrated bench rig. The BMS accepted charge correctly, thermal protection triggered as expected under load, and the protection circuit cut off cleanly at the low-voltage threshold.
• Fuel gauge recalibration after swap: On first use after installing this cell, disable VOOC or fast charging for one full discharge-charge cycle. The fuel gauge IC was calibrated to your old cell's discharge curve. Running one slow cycle at standard current lets the coulomb counter map the new cell before high-current charging begins.

Sudden shutdown at 20–30% on the A11x after a cell swap

This is a voltage cliff issue, not a capacity defect. The A11x's fuel gauge IC still holds the discharge curve from the old, degraded cell. When the new cell's voltage drops sharply under modem or screen load at the low end of the curve, the phone interprets it as a hard cutoff and shuts down even though charge remains. One full slow discharge to zero followed by a full charge resets the coulomb counter and remaps the curve to the new cell. After that cycle, the percentage reading stabilises and shutdowns at 20–30% stop.

USB fast charge not accepted on the first cycle after replacement

On the first charge after installation, the A11x may default to standard 5V charging and ignore the VOOC handshake. The charge IC runs a voltage and current sweep on any new cell before it negotiates a fast-charge protocol — this is a protection behaviour, not a fault. Plug into the original Oppo charger, let the first full charge complete without interrupting it, and the VOOC negotiation will work normally from the second cycle onward. If it still does not switch to fast charge after two full cycles, check the charge port for lint or debris before assuming a BMS issue.