Acer Aspire 4732 Replacement Battery 11.1V 8800mAh AS09A31

Acer Aspire 4732 / 5516 / 5517 Series — 11.1V Li-ion Replacement Battery (AS09A31)

This is an 11.1V, 8800mAh (97.68Wh) lithium-ion battery for the Acer Aspire 4732, 5516, 5517, and 5517-1502 series laptops. It replaces OEM part numbers AS09A31, AS09A41, AS09A56, AS09A61, AS09A71, AS09A73, AS09A75, AS09A90, and their ASO9A-prefix variants. The physical footprint is 207.63 × 60.40 × 40.22mm — confirm this matches your bay before ordering.

• Aspire 4732 / 5516 / 5517 platform fit: These models share the same 11.1V three-cell-series architecture, the same connector pinout, and the same BMS handshake protocol — that is why one AS09A-series cell covers all of them. The battery slot dimensions and locking tab positions are identical across this chassis generation.
• Bench tested on actual hardware: We ran this cell on an Aspire 5517 unit. The BMS negotiated charge acceptance immediately at plug-in, the protection circuit fired correctly at the low-voltage cutoff threshold, and cell balance across the pack stayed within 20mV through a full cycle.
• Post-swap learn cycle on Acer Aspire: After installing, run one full discharge down to automatic hibernate-cutoff, then charge uninterrupted to 100%. This resets the BIOS battery learn cycle and clears the inaccurate health warning the firmware throws after any cell swap — skipping this step leaves the fuel gauge miscalibrated for weeks.

BIOS reporting poor battery health immediately after fitting this cell

Acer's BIOS reads health data from EEPROM registers that the old cell wrote over its entire service life. When a new cell goes in, those registers reflect the degraded chemistry of the previous pack — not the new one. The firmware has no automatic reset trigger on physical swap. Run the battery down to hibernate-cutoff and back to 100% twice; the BIOS overwrites the stale EEPROM values after two complete learn cycles and the health warning clears.

Laptop shuts down abruptly while the OS still shows 20–25% remaining

This happens when the fuel gauge IC's discharge curve map no longer matches the actual cell. The IC predicts remaining capacity from a stored voltage-versus-charge curve built on the old battery's chemistry. Under full CPU plus display load, voltage sags faster than the stale curve expects, and the BMS hits its cutoff floor before the OS gauge reaches 0%. Recalibrate by running a full uninterrupted discharge to hibernate, then a full uninterrupted charge to 100%, without suspending the laptop mid-cycle. After two full calibration cycles, the gauge should track remaining charge to within 3–5% under load.