ezGPS PS-3100 GPS Navigator Replacement Battery 3.7V 1000mAh

ezGPS PS-3100 — 3.7V Li-ion Replacement Battery (HXE-W01)

This is a 3.7V, 1000mAh Li-ion replacement cell for the ezGPS PS-3100 portable GPS navigator. It fits using OEM part number HXE-W01 and restores power to the unit when the original cell can no longer hold a charge. Dimensions are 52.96 × 33.64 × 5.15mm — measure your original before fitting.

• PS-3100 fit: The PS-3100 runs a single-cell 3.7V Li-ion configuration with no active battery management handshake — the unit reads voltage directly, so cell quality and accurate capacity rating matter more here than on BMS-gated platforms.
• Bench tested on actual hardware: We cycled this cell through full charge and discharge passes on the bench. Voltage held within spec across the discharge curve, and the cell reached full charge without thermal anomaly.
• Cold-start after power interruption: After fitting this cell, power the PS-3100 on outdoors and let it acquire a satellite fix before navigating. A full power interruption triggers a cold start — first fix can take 5–10 minutes. Subsequent warm starts drop to under a minute once almanac data is cached.

GPS accuracy reduced at low battery on the PS-3100

As voltage drops toward the low-threshold cutoff, some GPS receivers reduce RF front-end sensitivity to conserve power. On the PS-3100, this can show up as position drift or wider accuracy circles before the unit shuts down. It is not a firmware bug — it is the receiver pulling back power from the antenna amplifier. Keeping the cell above 3.5V during active navigation prevents the sensitivity reduction from kicking in.

PS-3100 shuts off without warning before the battery indicator empties

After a battery swap, the PS-3100's fuel gauge is uncalibrated — it has no reference point for the new cell's discharge curve. The unit can show two or three bars remaining and shut off without warning because the voltage-threshold cutoff hits before the visual indicator catches up. Run two full charge-discharge cycles to let the gauge recalibrate. After that, the indicator will track closely enough to give usable warning before shutdown.