About this replacement
Acer Liquid E3 / E380 — 3.8V Li-Polymer Replacement Battery (BAT-A10)
This 3.8V, 2000mAh lithium-polymer cell replaces the BAT-A10 battery in the Acer Liquid E3, E380, V380, and Liquid Z5 smartphones. At 71.50 × 57.60 × 3.50mm, it matches the original footprint for direct swap during device repair. Capacity is 2000mAh (7.6Wh), identical to the factory specification.
- Liquid E3 / E380 / Z5 platform fit: These models share the same battery bay dimensions, connector pinout, and BMS handshake protocol. The BAT-A10 part number covers all variants, and the cell's NTC thermistor line matches the charge IC on each board.
- Bench tested on actual hardware: We cycled this cell through charge and load on the Liquid E3 platform. The BMS accepted the charge IC handshake without fault codes, and the protection circuit tripped correctly at the expected over-discharge threshold.
- Fuel gauge recalibration after swap: After installing this cell, run one full discharge to 5% and a complete charge to 100% before normal use. The Liquid E3's fuel gauge IC was calibrated to the old cell's discharge curve — one full cycle resets the coulomb counter against the new cell's actual capacity.
Why the Liquid E3 reports wrong battery percentage after a cell swap
The Liquid E3 uses a coulomb-counting fuel gauge IC that builds its capacity model from accumulated charge and discharge data on the original cell. When you install a new cell, the IC still references the old degraded discharge curve. Until it recalibrates, Android displays percentages that don't reflect actual charge state. One complete discharge-to-charge cycle overwrites the stored curve and aligns reported percentage with real cell voltage.
Sudden shutdown at 20–30% on the replacement cell
This happens when the modem transmitter or display backlight draws a current spike the cell cannot sustain at that state of charge — voltage collapses below the BMS cutoff threshold even though the gauge still shows 20–30%. It is more common in the first few cycles before the fuel gauge recalibrates. After two full discharge-charge cycles, the gauge tracks the real voltage cliff and the premature shutdowns stop. If shutdowns continue past three cycles, measure resting cell voltage at shutdown — it should read above 3.5V; anything below 3.4V points to a faulty cell.