MSI A32-A15 11.1V Laptop Compatible Battery 4400mAh

MSI A6400 / CX640 / CR640 Series — 11.1V Li-ion Replacement Battery (A32-A15)

This 11.1V, 4400mAh (48.84Wh) Li-ion cell replaces the original battery in MSI A6400, CX640, CR640DX, and CR640MX laptops. It fits directly onto the same connector and BMS handshake used across this MSI notebook line. Use it when the original cell no longer holds a charge or causes the laptop to shut down unexpectedly.

• A6400 / CX640 / CR640 platform fit: These models share the same 11.1V three-cell battery rail, connector pinout, and OEM part numbers — A32-A15, A41-A15, A42-A15, and A42-H36 all cross-reference to this same cell group. The BMS communicates over the same SMBus lines across every unit in this cluster.
• Bench tested on actual hardware: We ran this cell through charge and discharge cycles on a CX640 chassis. The BMS accepted the cell without error flags, completed a full charge cycle to 4.2V per cell, and held cutoff voltage at the expected threshold under load.
• Post-install discharge cycle on MSI notebooks: After fitting, run the laptop on battery until it hibernates at low-voltage cutoff, then charge uninterrupted to 100% without interruption. This resets the BIOS battery learn cycle and clears the inaccurate health warning that appears after every cell swap on this platform.

BIOS reporting battery health as poor immediately after fitting this cell

The MSI BIOS reads health data from EEPROM registers that were written by the original cell. A new cell carries different cycle count and capacity data, so the BIOS flags it as degraded on first boot — even when the cell is at full capacity. This is not a fault with the replacement. Run one complete discharge-to-hibernate followed by a full uninterrupted charge. After two to three of these learn cycles, the BIOS recalibrates and the health warning clears.

Laptop shutting down at 20–30% charge shown on screen

This happens when the fuel gauge IC has not yet calibrated against the new cell's actual voltage curve. The OS reads the state-of-charge from a table built on the old cell — so it reports 25% remaining while the real cell voltage has already hit the low-voltage cutoff threshold. The laptop shuts down because the hardware protection trips, not because the gauge is accurate. Run two full discharge-to-cutoff and charge-to-100% cycles; the fuel gauge IC updates its curve and the percentage readout aligns with actual cell voltage.