Fujitsu LifeBook E8310 Replacement Battery 10.8V 4400mAh

Fujitsu LifeBook E8310 Series — 10.8V Li-ion Replacement Battery (FPCBP145)

This is a 10.8V, 4400mAh (47.52Wh) Li-ion battery for the Fujitsu LifeBook E8310 and a broad range of LifeBook business notebooks. It replaces OEM part numbers FPCBP145, FPCBP282, FPCBP218, FPCBP219, FMVNBP177, FMVNBP178, and several others in the same voltage family. Compatible models include the LifeBook S7110, LH700, E752, and over 35 additional LifeBook variants sharing the same battery bay and connector spec.

• Cross-model fit on LifeBook business notebooks: These LifeBook models share a common 10.8V battery rail, identical bay dimensions, and the same connector pinout — which is why one cell covers such a wide model range without requiring a separate BMS handshake per unit.
• Bench tested on actual hardware: We cycled this battery through charge and discharge on a LifeBook unit and confirmed the BMS communicates state-of-charge correctly, holds charge to 100%, and does not trigger an early cutoff under combined CPU and display load.
• First-cycle reset for LifeBook battery learn: After installing, run one full discharge down to hibernate cutoff, then charge uninterrupted to 100%. This resets the BIOS battery learn cycle and clears the inaccurate health warning that commonly appears after a cell swap.

BIOS reporting poor battery health after installing a new cell

The LifeBook BIOS stores battery health data from the previous cell in its EEPROM. When a new cell goes in, the BIOS compares current readings against that old baseline and flags health as degraded — even though the new cell is fine. This is not a fault with the replacement battery. Run one complete discharge-to-hibernate then a full uninterrupted charge. After one or two full cycles, the BIOS recalibrates and the health warning clears.

Laptop shuts 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 voltage curve. The gauge estimates remaining charge using data from the old, degraded cell — so the percentage shown is wrong, and the laptop cuts out before the real fuel runs out. It is not a defective battery. Run two to three full discharge-to-hibernate and full-charge cycles without interruption. By the third cycle the fuel gauge IC has enough data to track the new cell accurately down to the correct cutoff voltage of around 9.0V.