About this replacement
Acer Aspire E1-571 / E5 Series — 10.8V Li-ion Replacement Battery (AL14A32)
This is a 10.8V, 4400mAh (47.52Wh) lithium-ion battery for the Acer Aspire E1-571 and E5 series laptops, including the E5-411, E5-421, and E5-421G among others. It replaces OEM part numbers AL14A32, KT.00603.008, KT.00603.013, AK.006BT.099, and 31CR17/65-2. Install it when the original cell no longer holds charge or the laptop won't run off AC.
- Aspire E1 and E5 platform fit: These models share the same 10.8V three-cell Li-ion architecture, identical connector pinout, and the same BMS handshake protocol — one battery services the full range without modification.
- Bench tested on actual hardware: We ran charge and discharge cycles on Aspire E5 hardware. The BMS negotiated correctly with the BIOS, charge current ramped as expected, and the protection circuit triggered cutoff at the rated low-voltage threshold without fault codes.
- First-cycle calibration on the Aspire E series: After fitting, run the laptop on battery until it hibernates from low charge, then charge uninterrupted to 100% without using the machine. This forces the Aspire's fuel gauge IC to re-learn the new cell's capacity curve and clears the inaccurate health warning that appears after every cell swap.
BIOS reporting poor battery health immediately after fitting the AL14A32
The Aspire BIOS reads health data from EEPROM registers that the old cell wrote over its lifetime. When a new cell goes in, those stale values don't match the fresh chemistry, and the BIOS flags the battery as degraded before it's even been used. This is a data mismatch, not a fault with the replacement. Run one complete discharge-to-hibernate cycle followed by a full uninterrupted charge to 100%. That sequence forces the BIOS to overwrite the legacy EEPROM data with values from the new cell.
Aspire shutting down unexpectedly at 20–30% charge shown on screen
This happens when the cell voltage drops below what the CPU and display can sustain under combined load — even though the gauge still shows charge remaining. The fuel gauge IC is calibrated against the old cell's discharge curve, so it underestimates how close the new cell is to its voltage cliff. The fix is calibration: drain fully to hibernate cutoff, then charge to 100% twice in a row without partial cycles. After two full cycles the gauge IC re-maps the curve and the shutdowns stop. Confirm the battery voltage reads above 11.1V at the charger before trusting the gauge again.