About this replacement
Redmi K60 Pro (22127RK46C) — 3.88V Li-Polymer Replacement Battery (BM5L)
This is a 3.88V, 4800mAh Li-Polymer replacement battery for the Redmi K60 Pro (model 22127RK46C). It replaces OEM part BM5L when the original cell degrades, swells, or no longer holds adequate charge. Installation requires disassembly of the rear panel and adhesive removal — professional fitting is recommended.
- K60 Pro and 22127RK46C fitment: Both model designations refer to the same hardware revision. The BM5L cell uses a matching connector pitch and BMS handshake profile, so the charge IC on the K60 Pro mainboard communicates correctly with the replacement cell from first boot.
- Bench tested on actual hardware: We cycled this cell through charge and discharge on the K60 Pro platform, confirming BMS communication, thermal reporting, and charge IC handshake. The cell accepted charge without fault flags on the second cycle once the fuel gauge IC had data to work from.
- Fuel gauge recalibration on first cycle: After installation, disable fast charging and run one full discharge down to automatic shutdown, then charge to 100% on standard 5V charging. The fuel gauge IC recalibrates its coulomb counter against the new cell's actual discharge curve before high-current fast charging applies load to an uncalibrated cell.
Why the K60 Pro reports wrong battery percentage after a BM5L cell swap
The K60 Pro uses a coulomb-counting fuel gauge IC that builds its percentage model from the discharge history of the installed cell. When you replace the cell, the IC still holds calibration data from the old, degraded battery. It maps the new cell's voltage curve against a worn reference, so the percentage displayed does not match actual charge state. One full discharge-to-shutdown followed by a complete charge to 100% forces the IC to rewrite its reference table against the new cell. Until that cycle completes, percentage readings and time-to-empty estimates will be inaccurate.
Sudden shutdown at 20–30% after fitting the BM5L replacement
This happens when the fuel gauge IC is still running the old cell's discharge curve and fails to predict the new cell's voltage cliff accurately. Under high-draw loads — 5G modem, sustained screen brightness, or active GPS — the cell voltage drops sharply below 3.5V per cell before the OS receives a low-battery warning. The system shuts down to protect the cell before the percentage reaches zero. Run one full calibration cycle as described above, then check: if shutdowns continue after calibration, measure resting voltage with a meter — a healthy rested BM5L cell should sit above 3.80V after a full charge.