Yakumo Q7M Laptop Replacement Battery 14.8V 4400mAh

Yakumo Q7M — 14.8V Li-ion Replacement Battery (442673100003)

This 14.8V 4400mAh (65.12Wh) lithium-ion battery is a direct replacement for the Yakumo Q7M notebook. It fits the Q7M's original battery bay and connector without modification. Voltage and capacity match the factory specification exactly.

• Q7M platform fit: The Q7M uses a 4-cell 14.8V battery architecture with a specific connector pinout and BMS handshake. This cell matches that voltage rail and communicates correctly with the Q7M's charge controller — the system recognises it as a valid battery rather than flagging an unknown device.
• Bench tested on actual hardware: We cycled this battery through charge, discharge, and BMS cutoff conditions. The protection circuit responded correctly to over-discharge events, and the charge controller accepted the cell without throwing a fault code.
• Post-install calibration on the Q7M: After fitting this battery, run one full discharge down to hibernate-cutoff, then charge uninterrupted to 100%. This resets the Q7M's BIOS battery learn cycle and clears the inaccurate health warning that appears after every cell swap — without it, the fuel gauge IC has no reference point for the new cell's actual capacity.

BIOS reporting poor battery health immediately after fitting this cell

The Q7M's BIOS reads health data from EEPROM registers that were written by the original cell over time. A new cell arrives with different EEPROM data, so the BIOS flags it as degraded before any real assessment has occurred. This is not a fault with the replacement cell. Run one full discharge-to-cutoff cycle followed by a complete uninterrupted charge, and the BIOS will overwrite the old health data with values from the new cell. After two or three cycles, the health reading stabilises.

Q7M 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 voltage curve. The displayed percentage is based on old reference data, so the system reads 20–30% while the actual cell voltage has already dropped below the safe cutoff threshold under CPU and display load. The laptop shuts off because the cell hits its voltage floor — not because the gauge is correct. Complete two full discharge-to-hibernate and charge-to-100% cycles, and the fuel gauge IC will remap its curve to match the new cell. After calibration, the shutdown point drops back to the expected low single digits.