Xiaomi Redmi Note 10 Pro BM57 Replacement Battery 3.87V 4900mAh

Xiaomi Redmi Note 10 Pro — 3.87V Li-Polymer Replacement Battery (BM57)

This is a 3.87V, 4900mAh (18.96Wh) Li-Polymer cell for the Xiaomi Redmi Note 10 Pro. It replaces the original BM57 battery when capacity fade causes shortened screen-on time or unexpected shutdowns. The cell measures 90.60 × 63.70 × 5.00mm and uses the same connector and flex as the factory unit.

• Redmi Note 10 Pro fit: The BM57 is specific to this model's battery bay dimensions and connector pinout. The fuel gauge IC on the Note 10 Pro board reads cell data over a dedicated line — the connector must seat fully or the OS will not recognise the battery at boot.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on a Redmi Note 10 Pro board. The BMS accepted the new cell without a fault flag, and the charge IC stepped through standard CC/CV without interruption.
• First-cycle fuel gauge recalibration: After installation, disable fast charging in Settings and run one complete discharge down to automatic shutdown, then charge to 100% on standard 10W. This gives the coulomb counter a clean reference discharge curve against the new cell before Xiaomi's 33W fast charge protocol starts pushing high current.

Sudden shutdown at 20–30% on the Redmi Note 10 Pro after a cell swap

This is a voltage cliff issue, not a defective cell. The fuel gauge IC still holds calibration data from the old degraded cell, so its voltage-to-percentage map is wrong for a fresh 4900mAh cell. Under modem or display load, actual cell voltage drops faster than the IC expects, and the board cuts power before the reported percentage hits zero. One full discharge-to-shutdown cycle followed by a full charge resets the coulomb counter to the new cell's actual discharge curve. After that cycle, shutdowns at 20–30% stop.

USB-PD or 33W fast charge not activating on the first charge after replacement

Xiaomi's proprietary fast charge handshake requires the charge IC to confirm cell voltage is within the acceptance window before stepping up current. On a new cell that has never been cycled, the IC sometimes reads cell impedance as out of range and falls back to 5W standard charging for that session. This is not a fault — it clears after the cell completes its first full charge cycle at standard rate. On the second charge, plug in and check the lock screen charging indicator; the 33W icon should appear within 30 seconds of connection.