About this replacement
Acer Liquid Gallant Duo E350 — 3.7V Li-ion Replacement Battery (AE415550 1S1P)
This 3.7V Li-ion cell at 1350mAh (5Wh) replaces the original battery in the Acer Liquid Gallant and Liquid Gallant Duo E350 smartphones. It fits the AK330 and E350 variants using OEM part numbers AE415550 1S1P, JD-201202-JLNP-C8-001, and KT.0010J.001. The cell measures 56.65 × 53.97 × 4.28mm and seats directly into the original battery bay.
- Liquid Gallant and E350 platform fit: The Gallant and Gallant Duo E350 share the same 3.7V single-cell architecture and connector pinout across the AK330 and E350 variants. The BMS handshake runs on a standard one-wire NTC thermistor line — no proprietary authentication chip to negotiate.
- Bench tested on actual hardware: We cycled this cell through full charge and load discharge on the E350 platform. The BMS held charge termination at 4.2V and cut off discharge cleanly at 3.0V under simulated screen and modem load — no unexpected trips.
- First-cycle fuel gauge recalibration: After installation, disable fast charging and run one complete discharge down to auto-shutdown, then charge to 100% uninterrupted. The fuel gauge IC in the E350 calibrates its coulomb counter against the new cell's discharge curve on that first full cycle — skipping it causes percentage jumps for the first several days of use.
Sudden shutdown at 20–30% on the Liquid Gallant after a cell swap
The E350's fuel gauge IC retains the discharge curve from the old degraded cell. When the replacement cell hits the voltage cliff around 3.5V under modem or display load, the phone shuts off even though the reported percentage still reads 20–30%. The IC hasn't mapped the new cell's actual capacity yet, so its voltage-to-percentage conversion is wrong. One full uninterrupted discharge-charge cycle resets the coulomb counter and eliminates the early shutdown.
Phone feels warm near the battery during the first few charges
A new Li-ion cell arrives with higher internal impedance than a broken-in cell. The charge IC on the E350 pushes its standard charge current into that higher impedance, which generates more heat than usual at the cell surface. This is normal for the first two to three cycles and reduces as the cell's impedance settles. If warmth continues past the third full charge, check that the battery connector is fully seated — a partial connection increases contact resistance and sustains the heat.