Averatec 4000 Replacement Battery M30-3S4400-C1S1 11.1V

Averatec 4000 Series — 11.1V Li-ion Replacement Battery (M30-3S4400-C1S1)

This is an 11.1V Li-ion replacement battery rated at 4400mAh (48.84Wh) for Averatec 4000 series notebook computers. It fits the 4000, 4100, 4100AH, 4155, and over 20 additional Averatec models sharing the same battery bay and connector. OEM part numbers covered include M30-3S4400-C1S1, M30-3S4400-G1L1, M30-3S4400-G1P1, 63-UJ1024-0A, 63GUJ1024-2A, and SA20071-01.

• 4000 and 4100 series compatibility: These models share the same 11.1V three-cell architecture, physical bay dimensions, and connector pinout. The BMS handshake is identical across this range, so the same cell works across all listed variants without modification.
• Bench tested on actual hardware: We cycled this cell through full charge and discharge on the 4000 platform. The BMS communicated correctly with the system, charge acceptance reached 100%, and no fault codes were triggered during the test sequence.
• Post-install calibration on the 4000 series: After fitting this battery, run one full discharge to hibernate-cutoff, then charge uninterrupted to 100%. This resets the BIOS battery learn cycle and clears the inaccurate health warning that routinely appears after a cell swap on this platform.

BIOS reporting poor battery health after fitting the replacement cell

The Averatec 4000 BIOS reads health data from EEPROM registers carried over from the original cell. When a new cell is fitted, those registers often still reflect the old cell's degraded state. The BIOS flags the battery as poor or unknown before it has completed a learn cycle against the new chemistry. Running one full discharge-to-hibernate followed by a full uninterrupted charge lets the system recalibrate and write accurate data to the fuel gauge IC.

Laptop shutting down at 20–30% shown on the gauge after battery swap

This happens when the fuel gauge IC has not yet calibrated against the new cell's actual voltage curve. The gauge shows 20–30% remaining, but the cell voltage has already dropped below the threshold the system needs to sustain full CPU and display load. The laptop cuts power before the gauge catches up. Run two to three full discharge and charge cycles — by the third cycle the gauge IC maps the new cell accurately and the shutdowns stop. After calibration, resting cell voltage at a reported 20% should read approximately 10.8V or above.