MeiZu Pro 6 BT53 Replacement Battery 3.8V 2500mAh

MeiZu Pro 6 / M570 Series — 3.8V Li-Polymer Replacement Battery (BT53)

This is a 3.8V, 2500mAh Li-Polymer replacement cell for the MeiZu Pro 6 smartphone (models M570M, M570C, M570Q). It replaces part number BT53 — the original cell used across the Pro 6 lineup. Swap this in when the original cell no longer holds charge through a standard day of use.

• M570M, M570C, M570Q compatibility: All three variants share the same battery bay dimensions, connector pinout, and BMS handshake protocol. The 68.36 × 61.00 × 4.10 mm cell fits each without modification, and the BT53 part number is consistent across all three PCB revisions.
• Bench tested on actual hardware: We ran this cell through charge and discharge cycles on a Pro 6 unit. The BMS accepted charging current without triggering thermal cutoff, and the protection circuit responded correctly to low-voltage thresholds at both ends of the cycle.
• First-cycle fast charge disable: After fitting a new cell, disable mCharge fast charging for one full discharge-charge cycle. This lets the fuel gauge IC map the new cell's discharge curve before high-current charging pushes against an uncalibrated coulomb counter.

Why the Pro 6 reports wrong battery percentage after a cell swap

The Pro 6 uses a fuel gauge IC that builds its capacity model from the discharge curve of the original cell. When a new cell goes in, the IC still references that old curve. Percentage readings can sit 10–20% higher than actual state of charge until the IC recalibrates. One complete discharge to auto-off followed by a full uninterrupted charge resets the coulomb counter against the new cell's actual curve. After that cycle, percentage accuracy returns to normal.

Sudden shutdown at 20–30% remaining on the replacement cell

This is a voltage cliff problem, not a capacity problem. When the modem fires at full power — during a call or a data burst — the draw pulls the cell voltage below the BMS cutoff threshold even though the gauge still shows charge remaining. It happens most often when the fuel gauge IC hasn't completed a recalibration cycle and the reported percentage is running ahead of real voltage. Run one full discharge-charge cycle without interruption. If shutdowns persist past that, check that the connector is fully seated — a high-resistance contact causes the same voltage sag under load, triggering cutoff at 3.2V.