Redmi Note 11E Pro BN5E Compatible Battery 3.87V 4900mAh

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

This is a 3.87V, 4900mAh Li-Polymer replacement battery for the Redmi Note 11E Pro smartphone. It uses OEM part number BN5E and fits directly into the Note 11E Pro chassis. Capacity is rated at 18.96Wh, matching the original cell specification.

• Note 11E Pro fit: The BN5E cell is specific to the Note 11E Pro — the connector pinout, BMS handshake protocol, and physical footprint (93.30 × 65.00 × 4.70mm) are not shared with other Note 11 variants. Fitting a different Note 11 battery will cause charge IC rejection or a loose connector.
• Bench tested on actual hardware: We ran this cell through the Note 11E Pro's charge IC and confirmed BMS communication, thermal reporting, and charge termination all behaved normally. The coulomb counter initialised correctly after one full discharge-to-charge cycle.
• First-cycle fast charging: On first use after installation, disable fast charging for one complete discharge-charge cycle. This lets the fuel gauge IC recalibrate its discharge curve against the new cell before high-current charging pushes load into an uncalibrated state. Re-enable fast charging after that first full cycle completes.

Why the Note 11E Pro reports wrong battery percentage after a cell swap

The Note 11E Pro uses a coulomb counter inside the fuel gauge IC to track charge state. When the original cell is removed, that counter loses its reference curve. The replacement cell has a slightly different internal resistance profile, so the IC initially maps percentage against the wrong discharge curve. This shows up as the reported percentage jumping or reading artificially high until the IC re-learns the new cell. One full discharge down to automatic shutdown, followed by a full charge, resets the calibration.

Sudden shutdown at 20–30% on the replacement cell

This happens when the modem or display draws a short high-current spike that the cell cannot hold voltage through. At around 3.55–3.60V under load, an uncalibrated or partially discharged Li-Polymer cell can sag below the protection threshold momentarily, triggering a hard cutoff. The phone reads 20–30% because the fuel gauge IC has not yet learned where the new cell's voltage cliff actually sits. Run one full calibration cycle — discharge to shutdown, charge uninterrupted to 100% — and the IC will map the real voltage cliff correctly.