About this replacement
Fujitsu LifeBook Q702 / Stylistic Q702 — 14.4V Li-Polymer Replacement Battery (CP588146-01)
This 14.4V, 3050mAh (43.92Wh) Li-Polymer battery is a direct replacement for the Fujitsu LifeBook Q702 and Stylistic Q702. It targets degraded or dead cells that leave the ultraportable stranded on AC power. OEM part numbers CP588146-01, FBP0287, FMVNBP221, and FPCBP374 all cross to this unit.
- LifeBook Q702 and Stylistic Q702 compatibility: Both platforms share the same 14.4V battery rail, connector pinout, and BMS handshake protocol. A single cell swap covers either device without adapter changes or firmware workarounds.
- Bench tested on actual hardware: We ran charge and discharge cycles on the Q702 platform. The BMS negotiated correctly with the host, charge acceptance held steady across cycles, and the protection circuit tripped cleanly at low-voltage cutoff without requiring a manual reset.
- Post-install calibration on the Q702: After fitting this battery, run one full discharge until the system hibernates, then charge uninterrupted to 100%. This resets the BIOS battery learn cycle and clears the false "poor health" warning that appears after every cell swap on the Q702.
BIOS reporting poor battery health immediately after fitting a new cell
The Q702 BIOS reads health data stored in the outgoing cell's EEPROM. When a new cell arrives, that EEPROM data is either blank or mismatched, so the BIOS flags the battery as degraded before it has run a single cycle. This is not a fault with the replacement cell. Run one full discharge-to-hibernate followed by a full uninterrupted charge to 100%. The BIOS learn cycle writes fresh data to the new cell and the health warning clears.
Q702 shutting down at 20–30% charge shown on the gauge
This happens when the fuel gauge IC has not yet calibrated against the new cell's actual voltage curve. The gauge under-reports remaining charge, and the system hits its shutdown threshold while the cell still holds usable capacity. It is not a dead cell. Complete two to three full discharge and charge cycles without interruption. After calibration, the displayed percentage aligns with the cell's real state of charge and early shutdowns stop.