About this replacement
Fujitsu LifeBook L1010 / P770 / S2210 Series — 11.1V Li-ion Replacement Battery (FPCBP220)
This 11.1V, 4400mAh (48.84Wh) Li-ion battery replaces the original FPCBP220 pack across the Fujitsu LifeBook L1010, P770, P8110, S2210, and related models. The cell matches the original voltage rail and connector pinout for the affected LifeBook lines. OEM part numbers FMVNBP186, FPCBP250, FPCBP283, FPCBP281, and several Fujitsu S26391 series codes are all covered by this replacement.
- LifeBook L1010, P770, P8110, S2210 compatibility: These models share the same 11.1V three-cell architecture, identical BMS connector pinout, and the same SMBus communication protocol — which is why a single replacement cell works across all of them without triggering a connector or handshake mismatch.
- Bench tested on actual hardware: We ran this cell through full charge-discharge cycles on LifeBook hardware. The BMS negotiated correctly over SMBus, charge acceptance reached 100%, and the protection circuit tripped cleanly at low-voltage cutoff without a hard shutdown event.
- Post-install calibration on LifeBook models: After fitting this battery, run one full discharge to hibernate cutoff, then charge uninterrupted to 100% before using the laptop again. This resets the BIOS battery learn cycle and clears the inaccurate health warning that appears after every cell swap on LifeBook firmware.
BIOS reporting poor battery health immediately after fitting a new cell
Fujitsu LifeBook firmware stores the previous battery's charge history in EEPROM and carries that data forward when a new cell is detected. The BIOS reads the old wear data, compares it against the new cell's reported capacity, and flags a health warning — even though the cell is brand new. This is not a fault with the replacement battery. Run the full discharge-to-hibernate then uninterrupted charge cycle once, and the BIOS battery learn routine will overwrite the stale EEPROM data with values from the new cell.
LifeBook shutting down at 20–30% charge shown on screen
This happens when the fuel gauge IC has not yet calibrated against the new cell's actual discharge curve. The gauge was trained on the old degraded cell and misjudges where the voltage cliff sits on the new one. Under combined CPU and display load, the cell hits its minimum sustain voltage before the gauge reaches 0% — the BMS cuts power to protect the cell. Complete two full discharge-to-hibernate and full-charge cycles, and the fuel gauge IC will recalibrate its endpoint to the correct voltage floor, typically around 9.0V for this 11.1V pack.