Megaware C2 Replacement Battery 11.1V 4400mAh Li-ion

Megaware C2 — 11.1V Li-ion Replacement Battery

This is an 11.1V, 4400mAh (48.84Wh) lithium-ion battery for the Megaware C2 laptop. It replaces the original cell when the existing battery no longer holds charge or fails to power the notebook. Dimensions are 136.27 × 72.20 × 20.09mm — confirm against your current battery before ordering.

• Megaware C2 fit: This battery matches the C2's voltage rail and physical connector. The BMS handshake is compatible with the C2's charge controller, so the laptop recognises the cell and manages charge cycles correctly.
• Bench tested on actual hardware: We cycled this cell through full charge and controlled discharge. The BMS held cutoff voltage correctly and did not trip early under sustained CPU and display load.
• First-cycle calibration on the C2: After fitting, run the laptop on battery until it hibernates at cutoff, then charge uninterrupted to 100%. This forces the C2's BIOS to run a battery learn cycle against the new cell and clears the inaccurate health warning that appears after every cell swap.

BIOS reporting poor battery health immediately after fitting the new cell

The C2's BIOS reads health data stored in the old cell's EEPROM and compares it against the new cell on first boot. Because the EEPROM data doesn't match fresh chemistry, the system flags poor health before a single charge cycle completes. This is a firmware comparison issue, not a fault with the replacement cell. Run one full discharge-to-hibernate cycle followed by an uninterrupted charge to 100% — this resets the learn cycle and updates the BIOS health reading.

Megaware C2 shuts down at 20–30% charge remaining

This happens when the fuel gauge IC has not yet calibrated against the new cell's actual discharge curve. The OS displays an estimated state of charge, but the cell voltage drops below the BMS cutoff threshold before the gauge reaches zero. The laptop interprets this as a hard low-voltage event and shuts down. Run two to three full discharge-to-hibernate cycles followed by complete charges — the fuel gauge IC recalibrates its curve and the early shutdowns stop. After calibration, the cutoff should align near 10.8V at the cell terminals.