Asus P1440FA Replacement Battery 14.4V 2800mAh Li-ion

Asus P1440FA Series — 14.4V Li-ion Replacement Battery (A41N1702-1)

This is a 14.4V, 2800mAh (40.32Wh) lithium-ion replacement battery for the Asus P1440FA notebook. It fits the P1440FA-FA0172R, P1440FA-FA1008R, P1440FA-FA0080, and over 30 additional P1440FA variants. It replaces OEM part numbers A41N1702-1 and 0B110-00480100.

• P1440FA platform compatibility: All P1440FA variants share the same 14.4V four-cell architecture, connector pinout, and BMS handshake protocol. Swapping between sub-models in this series requires no wiring changes — the same cell and BMS communicate identically across the lineup.
• Bench tested on actual hardware: We ran this cell through charge and discharge cycles on P1440FA hardware. The BMS accepted the charge handshake immediately, the fuel gauge IC began tracking from first cycle, and no error codes were thrown during draw under combined CPU and display load.
• Post-install calibration on the P1440FA: After fitting, run one full discharge to hibernate-cutoff, then charge uninterrupted to 100%. This resets the BIOS battery learn cycle and clears the inaccurate health warning that appears after every cell swap on this platform.

BIOS reporting poor battery health immediately after replacement

The BIOS on the P1440FA reads health data from EEPROM stored on the old cell. When a new cell goes in, that EEPROM data is gone — the BIOS defaults to a "poor health" or "replace battery" flag because it has no charge history to reference. This is not a fault with the replacement cell. Running a single full discharge-to-hibernate followed by an uninterrupted full charge resets the learn cycle and lets the BIOS build a fresh baseline. After one or two full cycles the health warning clears.

Laptop shuts off at 20–30% charge shown on screen

This happens because the fuel gauge IC is still calibrated to the old, degraded cell. The old cell's voltage cliff — the point where voltage drops sharply — occurred earlier in the discharge curve. The IC applies that same cliff point to the new cell, triggering a shutdown well before the new cell is actually empty. Run two to three full discharge-to-hibernate and full charge cycles. Each cycle lets the fuel gauge IC re-map the new cell's actual voltage curve, and the early shutdowns stop once the calibration catches up.