Xiaomi Redmi Note 11E Compatible Battery BN5H 3.87V 4900mAh

Xiaomi Redmi Note 11E Series — 3.87V Li-Polymer Replacement Battery (BN5H)

This is a 3.87V, 4900mAh (18.96Wh) Li-Polymer cell carrying OEM part number BN5H. It fits the Xiaomi Redmi Note 11E and Redmi Note 11E 5G. The battery restores full capacity to phones where the original cell has degraded past the point of useful daily operation.

• Redmi Note 11E and 11E 5G compatibility: Both models share the same battery bay dimensions, 3.87V nominal rail, and BN5H connector pinout. The BMS handshake protocol is identical across the LTE and 5G variants, so one cell covers both without modification.
• Bench tested on actual hardware: We ran the BN5H cell through full charge and discharge cycles on a Redmi Note 11E unit. The BMS accepted the cell without fault codes, thermal cutoff held within normal range, and charge current stepped through the expected CC/CV phases cleanly.
• First-cycle fast-charge handling: On first use after installation, disable fast charging and complete one full discharge-charge cycle at standard rate. This lets the fuel gauge IC map the new cell's discharge curve before high-current fast charging pushes elevated current into an uncalibrated cell.

Sudden shutdown at 20–30% on the replacement BN5H cell

This is a voltage cliff issue, not a capacity defect. Under peak load — active 5G modem, screen at full brightness, or a CPU-heavy task — the cell voltage drops faster than the fuel gauge IC predicted. The system interprets this as a critically low cell voltage and shuts down to protect the battery. It happens most often in the first few cycles because the coulomb counter is still calibrated to the old cell's internal resistance profile. Run two or three complete discharge-charge cycles and the fuel gauge recalibrates its voltage-to-percentage mapping against the new cell.

Phone not powering on after the BN5H sat in storage below 2.5V

Li-Polymer cells that discharge below roughly 2.5V per cell trigger a BMS lockout to prevent thermal runaway during recovery charging. A phone that will not respond to the charger or power button after a long storage period is almost certainly in this state. Connect the phone to a wall adapter — not a PC USB port — and leave it for 20–30 minutes without pressing anything. The charge IC applies a low-current trickle recovery voltage to bring the cell above the BMS re-enable threshold, typically around 2.8V, before normal charging resumes.