ELF0160 I-Mate Touch Replacement Battery 3.7V 1100mAh

I-Mate Touch — 3.7V Li-ion Replacement Battery (ELF0160)

This 3.7V, 1100mAh Li-ion cell replaces the original battery in the I-Mate Touch Windows Mobile smartphone. It matches the OEM part numbers ELF0160, 35H00095-00M, and FFEA175B009951. Capacity is 4.07Wh — identical to factory spec.

• I-Mate Touch fit: The Touch uses a single-cell 3.7V pack with a three-contact connector carrying voltage, ground, and a thermistor line. This cell matches that pinout and physical footprint (51.53 × 37.36 × 5.35mm), so the BMS handshake completes without errors on boot.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the Touch platform. The BMS accepted the cell on first insertion, charge current ramped correctly through CC/CV stages, and the protection circuit tripped at the expected over-discharge threshold.
• Fuel gauge recalibration on first use: After installation, run one full discharge down to auto-shutoff, then charge uninterrupted to 100% before normal use. The Touch's fuel gauge IC maps its capacity curve to the new cell during that first complete cycle — skipping it causes erratic percentage readings for the first several days.

Why the I-Mate Touch reports wrong battery percentage after a cell swap

The Touch uses a coulomb-counter-based fuel gauge IC that stores a learned discharge curve from the original cell. When a new cell goes in, that stored curve no longer matches actual cell behaviour, so the reported percentage drifts — sometimes reading 50% when the cell is nearly flat. The fix is one complete discharge-charge cycle with no interruptions. After that cycle, the IC overwrites its learned curve with data from the new cell and percentage accuracy stabilises. Expect some drift on the first cycle; it resolves by the second.

Sudden shutdown at 20–30% on the replacement cell

This happens when the cell voltage drops sharply under load — the Touch's modem radio and screen together can pull enough current to cause a brief voltage sag that the BMS reads as an under-voltage fault, triggering shutdown even though the fuel gauge still shows charge remaining. It is most common in the first few cycles before the fuel gauge IC has recalibrated. If shutdowns persist past the third full cycle, check that the battery contacts are clean and seated flat — a high-contact-resistance connection amplifies voltage sag at the same draw. After recalibration, the OS shuts down earlier in the discharge curve, above the sag threshold, and the problem stops.