Xiaomi Mi CC9e Pro BM52 Replacement Battery 3.85V 5150mAh

Xiaomi Mi Note 10 Pro / Mi CC9e Pro — 3.85V Li-Polymer Replacement Battery (BM52)

This is a 3.85V, 5150mAh (19.83Wh) Li-Polymer replacement battery for the Xiaomi Mi CC9e Pro, Mi Note 10 Pro, M1910F4E, and M1910F4S. It uses OEM part number BM52 and matches the original cell's dimensions at 121.15 × 40.30 × 6.00mm. Install it when the original cell no longer holds charge or causes unexpected shutdowns.

• Mi Note 10 series compatibility: The Mi CC9e Pro and Mi Note 10 Pro share the BM52 form factor, connector pinout, and BMS handshake protocol. The fuel gauge IC on both devices reads the same cell identification data, so the charge controller accepts this cell without flagging an unrecognised battery warning.
• Bench tested on actual hardware: We cycled this cell on an M1910F4S unit and confirmed the BMS negotiated charge cutoff correctly at 4.40V. The protection circuit triggered at the expected low-voltage threshold and recovered cleanly on reconnect.
• Fuel gauge recalibration after swap: After fitting this cell, disable fast charging in Settings and complete one full discharge-to-charge cycle at standard speed. This lets the coulomb counter in the fuel gauge IC map the new cell's discharge curve before high-current charging pushes current into an uncalibrated register.

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

The fuel gauge IC on these devices uses a learned discharge curve built up over hundreds of cycles with the original cell. When you install a new BM52 cell, the IC still references that old curve. The mismatch causes the percentage readout to jump or sit several points off the actual state of charge. One full slow discharge down to auto-shutdown followed by a complete charge to 100% resets the coulomb counter and re-anchors the gauge to the new cell's actual capacity.

Sudden shutdown at 20–25% on the replacement cell

This happens when the cell voltage drops below the modem or display's minimum rail requirement under load, even though the gauge still reads 20–25%. Li-Polymer cells have a steep voltage cliff at the low end of their curve, and a new cell's cliff sits at a slightly different point than the one the fuel gauge was calibrated to. The phone's PMIC cuts power before the gauge reaches 0% because the voltage collapsed faster than the counter predicted. Run two full discharge-recharge cycles without fast charging — this walks the coulomb counter back into alignment with the actual 3.40V cutoff point of the new cell.