Acer Aspire One 14 Z1401 Replacement Battery 10.8V 2200mAh

Acer Aspire One 14 Z1401 — 10.8V Li-ion Replacement Battery (NC4782-3600)

This is a 10.8V, 2200mAh Li-ion replacement battery for the Acer Aspire One 14 Z1401 series laptop. It fits the Z1401, Z1-401-C9JN, and related Aspire One 14 variants that use OEM part NC4782-3600. Capacity is 2200mAh (23.76Wh), matching the original cell specification.

• Z1401 series compatibility: These models share the same 10.8V three-cell series pack format (3S1P), the same connector pinout, and the same BMS communication protocol — which is why multiple OEM part numbers cross-reference to a single physical cell pack on this platform.
• Bench tested on actual hardware: We ran this cell on a Z1401 board and confirmed the BMS handshake completed correctly, the BIOS accepted the pack without flagging an unknown device, and charge current ramped normally from trickle to CC phase.
• Post-install discharge cycle on the Z1401: After fitting this battery, run one full discharge to the hibernate cutoff, 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.

BIOS reporting poor battery health immediately after fitting a new cell

The Aspire One 14 Z1401 stores battery health data in EEPROM on the pack itself. When a new cell goes in, the BIOS reads that EEPROM as blank or mismatched and flags it as degraded — even though the chemistry is fresh. This is not a fault with the replacement cell. Run one full discharge-to-hibernate followed by an uninterrupted charge to 100% to initialise the learn cycle. After two or three full cycles, the BIOS health reading will normalise.

Laptop shuts down at 20–30% charge shown on the gauge

This happens when the fuel gauge IC has not yet calibrated against the new cell's actual voltage curve. The gauge inherited capacity data from the old, degraded cell and is reading the remaining charge incorrectly. Under full CPU plus display load, the cell hits its low-voltage cutoff before the OS registers empty. Run two complete discharge-to-hibernate and charge-to-100% cycles — after that, the fuel gauge IC recalibrates and the shutdowns stop. If it persists past three cycles, check that charge voltage at the pack connector reaches 12.6V.