About this replacement
Acer Aspire E5-475G Series — 14.8V Li-ion Replacement Battery (AS16A5K)
This is a 14.8V, 2200mAh (32.56Wh) Li-ion battery for the Acer Aspire E5-475G and related E5-series laptops. It replaces OEM part numbers AS16A5K, AS16A7K, AS16A8K, and KT.0040G.007. The connector, cell count, and BMS handshake all match the original Acer specification.
- Aspire E5-475G, E5-523G, E5-553G, E5-573G compatibility: These models share a common 14.8V four-cell architecture with the same connector pinout and BMS communication protocol, which is why one cell pack covers all of them without modification.
- Bench tested on actual hardware: We ran this cell on an E5-series unit and confirmed the BMS initialised correctly, charge acceptance reached full capacity, and the protection circuit tripped cleanly at the low-voltage cutoff threshold without forcing a hard shutdown.
- Post-install calibration on Acer E5 units: After fitting, run the laptop on battery until it hibernates at low charge, then charge uninterrupted to 100% without interruption. This forces the BIOS battery learn cycle to reset against the new cell and clears the inaccurate health warning that appears after every cell swap on this platform.
Why the Aspire E5-475G shuts down at 20–30% battery remaining
The E5-475G runs the CPU and discrete GPU simultaneously under load, which draws peak current the aging original cell cannot sustain. When cell voltage sags under that combined load, it crosses the BMS cutoff threshold before the OS fuel gauge reaches zero. The laptop registers this as a shutdown at what looks like 20–30% remaining. A new cell with full capacity holds its voltage curve under load and eliminates this early cutoff behaviour.
BIOS reporting battery health as "Poor" immediately after fitting a new cell
The Acer BIOS reads health data cached in the battery's EEPROM, not live cell voltage. When a new cell is installed, the EEPROM data does not yet match the BIOS's learned discharge profile from the previous pack, so it flags the health as poor. This clears after one or two complete discharge-and-charge calibration cycles. Run the laptop to hibernate cutoff on battery, then charge fully to 100% — the BIOS updates its stored profile and the health warning disappears.