WinBook M100 14.8V Replacement Battery 442673400015

WinBook M100 / M200 / M300 / M400 — 14.8V Li-ion Replacement Battery (442673400015)

This is a 14.8V, 4400mAh (65.12Wh) Li-ion battery for the WinBook M100, M200, M300, and M400 notebook laptops. It replaces degraded or failed original packs that no longer sustain a usable charge under normal computing loads. Capacity and voltage match the factory specification exactly.

• M100–M400 platform compatibility: These four models share the same battery bay dimensions, connector pinout, and BMS communication protocol. The same cell pack works across all of them without modification or adapter.
• Bench tested on actual hardware: We ran this cell through charge and discharge cycles on the M-series platform. The BMS negotiated charge current correctly, reported state-of-charge to the OS, and held voltage stable across light to moderate CPU loads.
• First-cycle calibration on the WinBook M-series: After installing, run one full discharge to the hibernate cutoff, then charge uninterrupted to 100%. This resets the BIOS battery learn cycle and clears the inaccurate health warning that appears after every cell swap on this platform.

BIOS reporting poor battery health immediately after swap

The WinBook M-series BIOS reads EEPROM data written to the original cell during its first charge cycle. When a new cell goes in, that EEPROM data is blank or mismatched, so the system flags it as degraded before the battery has run a single cycle. This is a firmware read error, not a fault with the replacement cell. Running one full discharge-to-hibernate followed by an uninterrupted charge to 100% allows the BIOS to rewrite the learn-cycle data against the new cell and clear the warning.

Laptop shuts down with 20–30% charge still showing on screen

This happens when the fuel gauge IC is still calibrated to the old, degraded cell. The IC predicts cutoff voltage based on the old cell's discharge curve, so it trips the shutdown before the new cell is actually empty. The fix is two to three full discharge-and-charge calibration cycles — each time, let the laptop run down to automatic hibernate, then charge to 100% without interruption. After three cycles the fuel gauge IC recalibrates against the new cell's curve and the early-shutdown behaviour stops.