About this replacement
Xiaomi Mi Notebook Pro 15.6 — 7.6V Li-Polymer Replacement Battery (R15B01W)
This is a 7.6V, 7800mAh (59.28Wh) Li-Polymer battery for the Xiaomi Mi Notebook Pro 15.6 series. It fits models running the i3 8130U and i5 8250U processors across multiple storage configurations, including the A58511DD/CN variant. OEM part number R15B01W.
- Mi Pro 15.6 multi-config compatibility: All listed Mi Pro 15.6 variants share the same battery bay dimensions (329.40 × 77.10 × 8.00mm), the same 7.6V two-cell Li-Polymer architecture, and the same BMS handshake protocol. The connector is identical across the i3 and i5 board revisions, so one cell fits every listed config.
- Bench tested on actual hardware: We ran this cell through full charge and discharge cycles on a Mi Pro 15.6 i5-8250U board. The BMS accepted the cell without fault codes, charge termination triggered correctly at 8.7V, and the protection circuit tripped cleanly at the low-voltage cutoff threshold.
- Post-install calibration cycle: After fitting this cell, run the laptop down to hibernate cutoff, then charge uninterrupted to 100% without using the machine. This gives the fuel gauge IC a clean reference point against the new cell's actual capacity and clears the inaccurate health warning that appears in Mi AI after every battery swap.
Why the Mi Pro 15.6 shuts down at 20–30% after a battery swap
The Mi Pro's fuel gauge IC carries EEPROM data calibrated to the old cell's discharge curve. When a new cell goes in, the stored curve no longer matches actual cell behaviour. Under combined CPU and display load, the laptop hits a voltage cliff — cell voltage drops sharply while the gauge still shows 20–30% remaining, triggering an emergency shutdown. Running the full discharge-to-hibernate calibration cycle re-anchors the gauge to the new cell and eliminates the false cutoff.
BIOS reporting new battery health as poor immediately after replacement
The Mi Pro 15.6 BIOS reads cycle count and health data from the cell's EEPROM on every boot. A new cell arrives with a blank or factory-reset EEPROM, so the BIOS flags it as degraded or unknown — this is a data mismatch, not a faulty cell. Complete one full discharge-to-hibernate then uninterrupted charge-to-100% cycle. After that cycle the BIOS learn routine writes fresh reference data and the health status normalises. If it still shows poor after two full cycles, check that firmware is on the latest Mi Pro 15.6 BIOS release.