About this replacement
Acer Liquid Z110 Dou / Z2 Series — 3.7V Li-ion Replacement Battery (BA-Z1-001)
This 3.7V, 1300mAh Li-ion cell replaces OEM part numbers BA-Z1-001 and BA-Z1-003 in the Acer Liquid Z110 Dou, Z110, Liquid Z2, and Liquid Z2 Dual smartphones. It is a direct swap for an aged or swollen original cell that no longer holds a functional charge. Capacity matches OEM spec at 1300mAh (4.81Wh).
- Z110 and Z2 platform compatibility: Both the Z110 and Z2 lines share the same battery bay dimensions (64.95 × 43.98 × 4.20mm), connector pinout, and BMS handshake protocol — which is why a single cell covers both series. Swapping between models is not required; the shared architecture simply means one replacement SKU covers the full range.
- Bench tested on actual hardware: We ran this cell through full charge and discharge cycles on Z110 hardware. The BMS accepted the cell without fault codes, charge termination triggered correctly at 4.2V, and the protection circuit responded to simulated over-discharge at the expected cutoff threshold.
- Fuel gauge recalibration on first cycle: After fitting this replacement, run the phone from 100% down to automatic shutdown without interruption, then charge uninterrupted to full. The Z110's fuel gauge IC calibrates its coulomb counter against that first complete discharge curve — skipping this step causes the percentage readout to drift significantly in daily use.
Sudden shutdown at 20–30% on the Liquid Z110 after a cell swap
A new cell has a slightly different voltage-discharge curve than the aged cell the fuel gauge IC originally mapped itself to. When the phone hits a load spike — modem switching, screen at full brightness, or a background sync — the cell voltage sags below the protection threshold momentarily even though the reported percentage looks healthy. The BMS reads an undervoltage event and cuts power before the OS can react. One complete discharge-to-shutdown followed by an uninterrupted full charge lets the IC remap its internal curve to the new cell, after which the low-percentage shutdowns stop.
Phone won't power on after the replacement cell sat in storage
Li-ion cells self-discharge at roughly 1–3% per month in storage. If this cell shipped or sat installed without use for several months, the cell voltage may have dropped below 2.5V per cell — the threshold at which the BMS locks out charge acceptance to prevent unsafe recovery charging. Plugging directly into a wall charger often shows no response at all. To recover, connect to a charger and leave it undisturbed for 20–30 minutes; most BMS circuits include a trickle pre-charge mode that slowly raises voltage to 2.9–3.0V before allowing normal charge current to flow. Once the LED or screen shows any charging indicator, the BMS has accepted the cell and normal charging will complete.