About this replacement
Asus F5 / X50 Series — 11.1V Li-ion Replacement Battery (A32-F5)
This is an 11.1V Li-ion battery rated at 4400mAh (48.84Wh), built to replace the original A32-F5 cell in Asus F5 and X50 series laptops. It fits the F5, X50SL, X50R, and X50M, plus over 46 additional models that share the same connector and voltage rail. When the factory cell no longer sustains a charge under load, this replacement restores full portable operation.
- F5 and X50 platform fitment: Both series run the same 11.1V three-cell architecture, identical connector pinout, and the same BMS handshake protocol — which is why one part number covers such a wide model range. The BIOS authenticates via the battery's EEPROM data, and this cell carries the correct identifiers for that handshake to complete cleanly.
- Bench tested on actual hardware: We cycled this cell through full charge and discharge on F5-series hardware. The BMS engaged protection cutoff correctly at low-voltage threshold, and the charging IC accepted the cell without triggering fault flags or halting at the authentication step.
- Post-install calibration on Asus F5: After fitting, run one full discharge until the laptop hibernates on low-battery cutoff, then charge uninterrupted to 100%. This forces the BIOS battery learn cycle to recalibrate against the new cell and clears the inaccurate "poor health" warning that appears after every cell swap on this platform.
Why the Asus F5 shuts down at 20–30% after a battery swap
The BIOS fuel gauge IC maps voltage curves from the old cell's EEPROM data. When a new cell goes in, the stored discharge curve no longer matches actual chemistry, so the gauge reads voltage collapse earlier than it really occurs. Under full CPU and display load, the laptop interprets the voltage sag as a critical low point and triggers an emergency shutdown — even though the cell still has usable capacity remaining. Running two or three full discharge-to-hibernate and full-recharge cycles gives the fuel gauge IC enough data to re-anchor its curve to the new cell, after which the shutdowns stop.
BIOS reporting battery health as "poor" or "replace" immediately after install
This happens because the BIOS reads health status from EEPROM registers written by the old cell's charge history — not from live cell measurements. A brand-new cell inherits the previous cell's wear flags until a learn cycle overwrites them. The fix is straightforward: complete one uninterrupted full discharge to hibernate-cutoff, then a full charge to 100% without interruption. After that cycle completes, the BIOS rewrites the health registers against the new cell's actual data, and the warning clears.