About this replacement
Acer Liquid Z410 / M330 Series — 3.8V Li-ion Replacement Battery (BAT-A11)
This is a 3.8V, 2000mAh Li-ion cell built to replace the original BAT-A11 battery in the Acer Liquid Z410, Liquid M330, Liquid M330 LTE, and Liquid M330 Dual SIM. It matches the original dimensions at 65.90 × 53.00 × 4.85mm, so it seats correctly in the battery bay without modification. Voltage and capacity match the OEM spec exactly.
- Z410 and M330 platform fit: Both the Z410 and M330 lines share the same battery bay dimensions, connector pinout, and 3.8V nominal voltage rail — which is why a single BAT-A11 cell covers all variants. The BMS handshake on these devices authenticates via the connector rather than an NFC tag, so no additional pairing step is needed after installation.
- Bench tested on actual hardware: We ran this cell through charge and discharge cycles on a Z410 unit. The BMS accepted the cell on first connection, charge current ramped normally through CC phase, and the protection circuit tripped correctly at the low-voltage cutoff threshold — no false disconnects under display and modem load.
- Fuel gauge recalibration on first cycle: On first use after installation, disable fast charging and run one full discharge-to-charge cycle before enabling it again. The fuel gauge IC on the Z410 is calibrated to the old cell's discharge curve — a complete cycle with low current lets it remap against the new cell before higher charge current is applied to an uncalibrated state.
Sudden shutdown at 20–30% on the Liquid Z410 after a cell swap
The Z410's fuel gauge IC stores a discharge curve model from the previous cell. When a new cell is installed, the IC doesn't immediately know where the actual voltage cliff sits on the new cell. Under modem or display load, the cell voltage can drop sharply below the shutdown threshold before the gauge reads zero — causing an unexpected cutoff at 20–30% reported charge. This is not a fault in the replacement cell. Run one full discharge cycle down to automatic shutdown, then charge to 100% uninterrupted. After one complete cycle, the coulomb counter recalibrates and the percentage readout stabilises.
Phone feels warm near the battery bay during the first charge after replacement
A new Li-ion cell has higher internal impedance than a worn cell that has been through hundreds of cycles. On first charge, the charge IC on the Z410 may push current into this higher-impedance cell before it has been conditioned, generating slightly more heat than normal. This is expected on cycle one and typically normalises within two to three charge cycles as cell impedance settles. If warmth persists past the third full charge, check that the battery connector is fully seated — a partially engaged pin increases contact resistance and sustains elevated heat.