Fujitsu LifeBook A6000 Replacement Battery FPCBP159 14.4V

Fujitsu LifeBook A6000 Series — 14.4V Li-ion Replacement Battery (FPCBP159)

This is a 14.4V 2200mAh Li-ion replacement battery for the Fujitsu LifeBook A6000 notebook. It carries OEM part numbers FPCBP159 and FPCBP159AP. It also fits the LifeBook A6010, A3110, and A3100 series laptops.

• A6000 and A3100 series fit: These models share the same 14.4V battery rail, connector pinout, and BMS handshake protocol — so one cell works across the range without any adapter or firmware change.
• Bench tested on actual hardware: We ran this cell through full charge and discharge cycles on LifeBook A6000 hardware. The BMS negotiated correctly, protection circuits triggered at expected voltage thresholds, and the charge controller accepted the cell without faults.
• First-cycle calibration on the LifeBook: After installing, run one full discharge until the laptop hibernates on low battery, then charge uninterrupted to 100%. This forces the LifeBook's fuel gauge IC to re-learn the new cell's capacity curve and clears the inaccurate health warning the BIOS flags after every cell swap.

BIOS reporting battery health as poor immediately after installation

The LifeBook BIOS stores battery health data in EEPROM and compares it against the previous cell's cycle count and capacity history. A new cell with no EEPROM wear data triggers a mismatch, which surfaces as a "poor" or "replace battery" warning even when the cell is brand new. This is not a fault — it is a calibration state. Run one complete discharge-to-hibernate then a full uninterrupted charge to 100%, and the BIOS will update its health record to reflect the new cell.

Laptop shuts down abruptly at 20–30% charge shown on screen

The fuel gauge IC on the LifeBook's motherboard uses a stored capacity model to estimate remaining charge — but that model is calibrated to the old cell. Under combined CPU and display load, the new cell briefly sags in voltage, and the IC misreads the sag as a near-empty state and triggers shutdown. The fix is to run two or three full discharge-and-charge cycles so the fuel gauge IC builds an accurate model of the new cell's voltage curve. After calibration, the shutdowns stop and the percentage reading stabilises.