Acer Aspire 3 A314-32 Replacement Battery AP18B18J 7.6V 4500mAh

Acer Aspire 3 A314-32 — 7.6V Li-Polymer Replacement Battery (AP18B18J)

This is a 7.6V, 4500mAh (34.2Wh) Li-Polymer replacement battery for the Acer Aspire 3 A314-32 series notebooks. It carries OEM part number AP18B18J and fits the A314-32-C00A, A314-32-C087, A314-32-C1K9, and over 28 additional A314-32 variants. Swap it in when the original cell no longer holds charge or the laptop cuts out during unplugged use.

• A314-32 series fit: All A314-32 variants listed share the same 7.6V two-cell Li-Polymer architecture, the same AP18B18J connector pinout, and the same BMS handshake protocol — which is why one part number covers the full run of this sub-series.
• Bench tested on actual hardware: We ran this cell through charge, discharge, and BMS communication checks on an A314-32 unit. The BMS initialised correctly, reported state-of-charge accurately, and the protection circuit tripped at the expected low-voltage threshold without a forced hard cutoff.
• First-cycle reset on the A314-32: After installing, let the laptop discharge fully to hibernate cutoff — do not interrupt it. Then charge uninterrupted to 100%. 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.

Laptop shutting down at 20–30% shown after battery swap on the A314-32

When the A314-32 shuts down abruptly at what the OS shows as 20–30% remaining, the cause is usually a voltage cliff in the new cell under combined CPU and display load. The fuel gauge IC has not yet mapped the new cell's discharge curve, so the percentage shown is based on the old cell's EEPROM data. Under heavy load, actual cell voltage drops below the BMS protection threshold faster than the gauge predicts, triggering an immediate shutdown. Run two full discharge-to-hibernate and uninterrupted charge cycles to let the fuel gauge IC recalibrate — after that, shutdown should track with the displayed percentage.

BIOS reporting battery health as poor or unknown immediately after fitting AP18B18J

The A314-32 BIOS reads a health score from the EEPROM embedded in the battery's BMS on every boot. A brand-new replacement cell resets that EEPROM, so the BIOS has no cycle history to reference and flags the status as poor or unknown. This is not a fault with the cell — it is the BIOS reacting to zero-history EEPROM data. Complete one full discharge-to-hibernate followed by one uninterrupted charge to 100%, then reboot. The BIOS learn cycle will write new baseline data and the health warning will clear.