BN5E Xiaomi Redmi Note 11E Pro Replacement Battery 3.87V 4900mAh

Xiaomi Redmi Note 11E Pro — 3.87V Li-Polymer Replacement Battery (BN5E)

This is a 3.87V, 4900mAh Li-Polymer replacement battery for the Xiaomi Redmi Note 11E Pro. It fits the BN5E slot directly and restores the phone's full operating capacity. Use it when the original cell has degraded, swells, or no longer holds a usable charge.

• Redmi Note 11E Pro fit: The BN5E cell matches the connector pinout, physical dimensions (93.30 × 65.00 × 4.70mm), and BMS handshake the phone's charge IC expects. No adapter or modification needed.
• Bench tested on actual hardware: We ran this cell through full charge and discharge cycles on the Redmi Note 11E Pro. The BMS accepted the charge curve without tripping over-voltage cutoff, and the fuel gauge IC tracked state-of-charge accurately after one full calibration cycle.
• Fuel gauge recalibration after install: On first use, disable fast charging and run one complete discharge down to auto-shutdown, then charge to 100% uninterrupted. This lets the coulomb counter recalibrate against the new cell's discharge curve before high-current fast charging applies significant load to an uncalibrated gauge.

Sudden shutdown at 20–30% on the BN5E replacement cell

This happens when the fuel gauge IC is still calibrated to the old cell's discharge curve. The old cell had a different internal resistance profile, so the gauge miscalculates remaining voltage under load. When the modem fires a transmission burst or the screen peaks brightness, current draw spikes and the actual cell voltage drops below the cutoff threshold — even though the percentage shown is 25%. One full discharge-to-shutdown followed by an uninterrupted charge to 100% resets the coulomb counter against the new cell's curve and eliminates these shutdowns.

USB-PD fast charge not activating on first cycle after replacement

After a cell swap, the phone's charge IC may default to standard 5V charging on the first cycle. This is a handshake timing issue — the BMS in a new cell takes one full cycle before it signals the correct charge acceptance rate to the power delivery controller. If fast charge does not activate, complete one standard charge cycle to 100%, disconnect, and reconnect the charger. Fast charge should re-negotiate correctly from the second cycle onward at the expected voltage step.