Redmi Note 10 Pro BM57 Replacement Battery 3.87V 4900mAh

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

This is a 4900mAh, 3.87V lithium-polymer cell for the Redmi Note 10 Pro smartphone. It replaces the original BM57 battery when the existing cell has degraded, swells, or can no longer hold a useful charge. Installing a new cell restores full device functionality without replacing the handset.

• Note 10 Pro fitment: The BM57 cell is specific to the Note 10 Pro chassis. Connector orientation, physical dimensions (90.60 × 63.70 × 5.00mm), and the BMS handshake profile match the original board layout. Do not attempt to fit this cell in other Note 10 variants — the connector and board communication differ.
• Bench tested on actual hardware: We cycled this cell through a full discharge-charge sequence on a Note 10 Pro unit. The BMS accepted the cell without error flags, charge IC ramped to full current normally, and the fuel gauge registered 4900mAh capacity within one complete cycle.
• First-cycle calibration tip: On first use after installation, disable fast charging and complete one full discharge-charge cycle at standard rate. This lets the fuel gauge IC build an accurate discharge curve for the new cell before high-current charging begins on an uncalibrated cell.

Why the Note 10 Pro reports wrong battery percentage after a cell swap

The fuel gauge IC on the Note 10 Pro uses a coulomb counter calibrated to the original cell's discharge curve. When a new cell is installed, that stored curve no longer matches the actual cell behaviour. The gauge reads residual data from the old cell and reports incorrect state-of-charge values until it relearns. One complete slow discharge to below 5%, followed by an uninterrupted charge to 100%, forces the IC to reset its reference points against the new cell.

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

This happens when the fuel gauge IC has not yet mapped the new cell's voltage cliff — the point where cell voltage drops sharply under load from the modem or display. The OS sees 25% state-of-charge but the cell voltage collapses below the BMS cutoff threshold under peak current draw, triggering an immediate shutdown. Run two full slow cycles first, then check that the phone does not shut down under screen-on and cellular load above 20%. If shutdowns persist past three full cycles, verify the installed cell voltage reads above 3.6V at rest before charging.