HP OmniBook 3000 Replacement Battery 14.4V 4400mAh F1045A

HP OmniBook 3000CTX-F1391A — 14.4V Li-ion Replacement Battery (F1045A)

This is a 14.4V Li-ion replacement battery rated at 4400mAh (63.36Wh) for the HP OmniBook 3000CTX-F1391A and OmniBook 2100 series laptops. It replaces OEM part numbers F1045A, F1382-60901, and F1382A. The battery slots into the OmniBook 3000 series chassis and connects to the system board via the original bay connector.

• OmniBook 3000 and 2100 series fitment: These models share the same battery bay dimensions, connector pinout, and 14.4V supply rail. The BMS handshake protocol is identical across the range, so one cell fits the full group without adapter or modification.
• Bench tested on actual hardware: We ran this cell through a full charge-discharge cycle on an OmniBook 3000 series unit. The BMS accepted the cell without fault codes, charge current ramped correctly through CC-CV stages, and cutoff triggered cleanly at the low-voltage threshold.
• First-cycle recalibration on OmniBook 3000: After fitting, run the laptop off battery only until it hibernates at low-charge cutoff, then charge uninterrupted to 100%. This forces the BIOS battery learn cycle to reset against the new cell and clears the inaccurate health warning that appears after every cell swap on this platform.

BIOS reporting poor battery health immediately after fitting a new cell

The OmniBook 3000 BIOS reads health data from EEPROM flags written by the previous cell over its lifespan. A fresh cell carries no EEPROM history, so the BIOS flags it as degraded on first boot. This is a firmware interpretation issue, not a fault with the replacement cell. Run one complete discharge-to-hibernate then a full uninterrupted charge — this resets the learn cycle and the health flag clears. After two or three cycles the fuel gauge IC aligns to the new cell's actual capacity.

Laptop cutting off at 20–30% charge shown on the status bar

This happens when the fuel gauge IC has not yet calibrated to the new cell's discharge curve. The displayed percentage is based on the old cell's voltage-to-capacity mapping, so the reading drifts early and the system shuts down before the gauge catches the real cutoff point. It is not a cell fault — the battery still holds full capacity. Run two full discharge and charge cycles without interruption; by the third cycle the gauge IC recalculates the curve and the shutdowns stop. If cutoff still triggers above 15% shown after three cycles, check that the BIOS firmware is at the latest revision for the OmniBook 3000 platform.