About this replacement
Asus F8Sn / F80 Series — 11.1V Li-ion Replacement Battery (A32-A8)
This is an 11.1V 4400mAh (48.84Wh) Li-ion battery that replaces the A32-A8 cell in Asus F8Sn, F8, A8000Ja, and related notebooks. It fits the original battery bay and connects to the same three-pin system bus. Voltage and capacity match the OEM spec exactly.
- F8 and A8 platform compatibility: These models share a common battery bay geometry, 11.1V three-cell voltage rail, and the same BMS communication protocol over the SMBus connector. One cell covers the full range.
- Bench tested on actual hardware: We ran this cell in an F8Sn chassis. The BMS handshake completed on first insertion, charge current ramped normally through CC/CV stages, and the protection circuit tripped correctly at low-voltage cutoff under a simulated discharge load.
- Post-install learn cycle on the F8 platform: After fitting this cell, discharge the laptop fully until it hibernates, then charge uninterrupted to 100% without interrupting the session. This resets the BIOS battery learn cycle and clears the inaccurate health warning that appears after a cell swap on this platform.
BIOS reporting poor battery health immediately after fitting a new A32-A8
The F8 platform stores battery health data in EEPROM on the old cell. When you swap to a new cell, the BIOS reads that history and flags poor health before any real-world data exists on the new chemistry. This is not a fault with the replacement — it is stale EEPROM data carried over from the previous battery. Run one complete discharge-to-hibernate cycle followed by a full uninterrupted charge. The BIOS battery learn cycle will overwrite the old health data and the warning clears.
Laptop shuts down abruptly when gauge shows 20–25% remaining
This happens when the fuel gauge IC has not yet calibrated against the new cell's actual discharge curve. The IC is still using voltage thresholds mapped to the old, degraded cell, so it misreads remaining capacity and triggers shutdown before the cell is truly empty. It is not a defective battery. Run two to three full discharge-to-hibernate and charge-to-100% cycles — after each pass the gauge IC updates its internal model. By the third cycle, the reported percentage at shutdown should align with actual cell voltage, which at true cutoff sits at approximately 9.0V across the three cells.