Redmi BP47 Note 11 Pro+ Replacement Battery 7.74V 2150mAh

Redmi Note 11 Pro+ — 7.74V Li-Polymer Replacement Battery (BP47)

The BP47 is a 7.74V, 2150mAh Li-Polymer cell that fits the Redmi Note 11 Pro+, Note 11 Pro Plus, Note 11 Pro+ 5G, and model 21091116UC. It restores power to a phone that no longer holds charge or shuts down unexpectedly. Capacity is 16.64Wh at rated voltage.

• Note 11 Pro+ series fit: These models share the BP47 footprint, connector pinout, and BMS handshake protocol. The 93.30 × 64.70 × 4.80mm cell slots into the same chassis cavity without modification to the flex cable or rear housing.
• Bench tested on actual hardware: We ran this cell through a full charge-discharge cycle on a Note 11 Pro+ unit and confirmed the BMS accepted the cell, reported state-of-charge correctly after calibration, and passed the thermal check at the charge IC.
• First-cycle fast charge lockout: After installation, disable fast charging for one complete discharge-charge cycle. The fuel gauge IC is calibrated to the old cell's discharge curve. Running fast charge into an uncalibrated cell can cause the coulomb counter to read incorrectly from the first cycle onward.

Sudden shutdown at 20–30% on the replacement cell

A fresh BP47 can trigger unexpected shutdowns when the phone reports 20–30% remaining. The fuel gauge IC still holds the discharge curve of the old, degraded cell. When the new cell's actual voltage drops under modem or display load, the IC has no accurate map to follow and forces a protection shutdown. One full discharge-charge cycle — taken to near-zero and back to 100% without fast charging — gives the coulomb counter enough data to remap against the new cell. After that cycle, shutdowns at mid-charge should stop.

Phone will not power on after the BP47 sat in storage

Li-Polymer cells in storage self-discharge. If the BP47 has dropped below roughly 2.5V per cell, the BMS trips into lockout mode and blocks current flow to protect the cell from deep-discharge damage. The phone will show no response to the power button. Connect to a 5V charger and leave it for 15–20 minutes without pressing anything — the charge IC applies a low-current trickle that can bring the cell above the BMS recovery threshold. Once voltage recovers above 3.0V per cell, the BMS releases lockout and the phone will boot normally.