BN5F Xiaomi Redmi Note 12 Pro Compatible Battery 3.82V 5000mAh

Xiaomi Redmi Note 12 Pro / Redmi A2 — 3.82V Li-Polymer Replacement Battery (BN5F)

This is a 3.82V, 5000mAh Li-Polymer battery built to the BN5F specification. It fits the Xiaomi Redmi Note 12 Pro (23028RN4DG), Redmi A2, and the 23026RN54G variant. Capacity is 5000mAh (19.1Wh), matching the original cell specification.

• Cross-model fit — 23028RN4DG, Redmi A2, 23026RN54G: These three models share the same BN5F cell footprint, connector pinout, and BMS handshake protocol. The 3.82V nominal rail and NTC thermistor wiring are identical across all three, so one cell serves the entire group without modification.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on Redmi Note 12 Pro hardware. The BMS accepted the charge IC handshake cleanly, thermistor readings stayed within spec, and the fuel gauge IC tracked state-of-charge without reporting errors.
• First-cycle fast charge protocol: On first use after installation, disable fast charging for one complete discharge-charge cycle. This lets the fuel gauge IC recalibrate against the new cell's actual discharge curve before high-current charging pushes into an uncalibrated coulomb counter.

Sudden shutdown at 20–30% on the BN5F replacement cell

This is a voltage cliff issue, not a capacity defect. Under peak load — 5G modem polling, a bright screen, and background sync hitting simultaneously — the cell voltage drops faster than the fuel gauge IC predicts. The IC was calibrated against the old, degraded cell curve, so its 20–30% estimate is wrong; the actual cell voltage has already fallen below the BMS cutoff threshold. One full discharge-to-shutdown followed by a full charge corrects the coulomb counter and eliminates most of these events.

OS reporting wrong percentage after cell swap

The Redmi fuel gauge IC stores learned discharge data from the original cell in non-volatile memory. When the BN5F replacement goes in, that stored curve no longer matches the new cell's actual voltage-to-capacity relationship. The phone reads the voltage correctly but maps it to the wrong percentage. Run one complete discharge from 100% to automatic shutdown, then charge uninterrupted to 100% — this forces the IC to rewrite its reference curve against the new cell and restores accurate percentage reporting.