Fujitsu FMV-BIBLO NB75K 14.4V Replacement Battery 644180

Fujitsu FMV-BIBLO NB75K Series — 14.4V Li-ion Replacement Battery (FPCBP83)

This is a 14.4V, 2200mAh (31.68Wh) Li-ion battery for the Fujitsu FMV-BIBLO notebook range. It covers the NB75K, NB75H/T, NB75G, NB55L/T, and over 30 additional FMV-BIBLO models sharing the same voltage rail and connector. OEM part numbers include FPCBP83, FPCBP83AP, FM-41, 644180, 644190, 644260, 644270, and 644290.

• FMV-BIBLO NB-series compatibility: These models share a common 14.4V four-cell architecture with identical BMS handshake and connector pinout. Swapping between NB75 and NB55 variants does not require a different cell — the same voltage rail and charge profile applies across the entire group.
• Bench tested on actual hardware: We ran this cell on FMV-BIBLO hardware and confirmed the BMS negotiated charge termination correctly at 16.8V. The protection circuit tripped at the expected low-voltage threshold with no false cutoffs during discharge.
• Post-installation calibration on FMV-BIBLO: After fitting this cell, 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 appears after swapping cells in these notebooks.

BIOS reporting poor battery health immediately after fitting a new cell

The FMV-BIBLO BIOS reads health data stored in the outgoing battery's EEPROM and compares it against the new cell's reported state. A fresh cell with no cycle history can trigger a false "degraded" or "poor health" flag because the BIOS expects some charge history to validate the data. This is not a fault with the replacement cell. Running one full discharge-to-hibernate followed by an uninterrupted charge to 100% writes a new baseline to the fuel gauge IC and clears the warning on the next boot.

FMV-BIBLO shutting down at 20–30% charge remaining

This happens when the cell voltage drops sharply under combined CPU and display load — a voltage cliff that the OS fuel gauge does not predict accurately after a cell swap. The fuel gauge IC is still calibrated to the old cell's discharge curve, so the percentage shown does not match the actual remaining charge. The laptop hits the hardware low-voltage cutoff before the OS-reported percentage reaches zero. Fix this by completing two to three full discharge-and-charge cycles so the fuel gauge IC re-maps its curve to the new cell's actual chemistry — after that, shutdown should occur at or below 5% reported charge.