Redmi Note 11E Replacement Battery BN5H 3.87V 4900mAh

Redmi Note 11E / Note 11E 5G — 3.87V Li-Polymer Replacement Battery (BN5H)

This is a 3.87V, 4900mAh Li-Polymer replacement battery for the Redmi Note 11E and Note 11E 5G smartphones. OEM part number BN5H. It slots into the original battery bay and connects via the existing flex cable and fuel gauge circuit.

• Note 11E and Note 11E 5G compatibility: Both the 4G and 5G variants of the Note 11E use the same BN5H cell, same connector pinout, and the same fuel gauge IC on the motherboard. The 5G modem draws higher peak current during handshake bursts, so the cell must meet the same discharge rate spec as the 4G model — this one does.
• Bench tested on actual hardware: We cycled this cell on a Note 11E unit, monitoring BMS handshake, charge acceptance at full current, and cutoff behaviour at low state of charge. The BMS accepted the cell without fault flags, and charge termination triggered correctly at 4.35V.
• Fuel gauge recalibration on first cycle: On first use after installation, disable fast charging and run one complete discharge-charge cycle at standard current. This lets the fuel gauge IC map the new cell's discharge curve before the coulomb counter locks in its reference points — skipping this step is the main cause of erratic percentage readings post-swap.

Why the Note 11E reports wrong battery percentage after a BN5H cell swap

The fuel gauge IC on the Note 11E motherboard stores a learned discharge curve from the original cell. When a new cell goes in, that stored curve no longer matches the actual voltage-to-capacity relationship of the replacement. The gauge reads voltage but maps it against old data, so it reports a percentage that drifts from reality — typically showing full until a sudden drop. One full discharge-charge cycle at standard current forces the coulomb counter to relearn the curve against the new cell.

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

This happens when the display or modem pulls peak current and the cell voltage dips below the BMS cutoff threshold — even though the gauge still shows charge remaining. It is a voltage sag issue, not a capacity issue. A fresh cell running on an uncalibrated fuel gauge will show inflated percentages, so the phone shuts down at what looks like 25% but is actually closer to 5% real charge. Run the recalibration cycle first; if shutdowns persist after that, check that cell voltage at rest reads above 3.6V before use.