About this replacement
Acer Aspire V5-591G Series — 11.1V Li-ion Replacement Battery (AL15B32)
This is an 11.1V, 4400mAh (48.84Wh) Li-ion replacement battery for the Acer Aspire V5-591G 15.6-inch notebook. It replaces OEM part AL15B32 and fits the V5-591G, V5-591G-50BA, Aspire V15 V5-591G, and V5-591G EDG variants, among others. Install it when the original cell no longer holds charge or the laptop fails to run on battery power.
- Aspire V5-591G platform fit: All V5-591G variants share the same AL15B32 connector pinout, voltage rail, and BMS communication protocol. The battery management system handshake is consistent across the full model range, so one cell covers every suffix in the lineup.
- Bench tested on actual hardware: We ran this cell on a V5-591G unit and logged the BMS charge cycle from 0% to 100%. The protection circuit held charge termination correctly at full voltage with no thermal events and no premature cutoff under combined CPU and display load.
- Post-install recalibration on the V5-591G: After fitting, run the laptop down to hibernate cutoff on battery power, then charge uninterrupted to 100% without unplugging. 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 fitting a new AL15B32
The V5-591G BIOS reads health data from EEPROM stored on the old cell. When a new cell goes in, that EEPROM data is gone, and the BIOS flags the battery as unknown or degraded before any charge cycle has run. This is not a fault with the replacement cell — it is a data gap the firmware needs to fill. One full discharge-to-hibernate followed by a complete uninterrupted charge gives the BIOS enough cycle data to recalculate health accurately. After that cycle, the warning clears and the health status updates to reflect the new cell.
Laptop shuts down at 20–30% remaining after battery swap
This happens because the fuel gauge IC has not yet calibrated against the new cell's actual voltage curve. The old calibration data maps a voltage cliff at a point that does not match the new chemistry, so the system cuts power while charge remains. Under full CPU and display load, this voltage sag triggers a premature shutdown even when the gauge still shows capacity remaining. Run two complete discharge-to-hibernate and full-recharge cycles — by the second cycle, the fuel gauge IC recalibrates and the shutdowns stop.