Curtis GPD430 GPS Replacement Battery 3.7V 800mAh Li-ion

Curtis GPD430 GPS Navigator — 3.7V Li-ion Replacement Battery

This 3.7V, 800mAh Li-ion cell replaces the original battery in the Curtis GPD430 and GPD 430 GPS portable navigator. It fits directly into the battery compartment and matches the original voltage rail. Capacity is 800mAh (2.96Wh) — identical to the factory specification.

• GPD430 and GPD 430 GPS fit: Both model variants use the same battery compartment dimensions (47.90 × 44.10 × 5.55mm), the same 3.7V nominal voltage, and the same connector orientation — so one cell covers both designations without modification.
• Bench tested on actual hardware: We ran this cell through charge and discharge cycles on a GPD430 unit. The BMS held the charge threshold correctly and the device powered on without flagging a low-voltage fault at startup.
• First-fix satellite acquisition after swap: After fitting this cell, power the GPD430 on outdoors with a clear sky view and let it run through its cold start. A cold start after full power removal can take 5–10 minutes to acquire a fix — this is normal. Subsequent warm starts drop back to under a minute once almanac data is cached.

GPS accuracy dropping at low charge on the GPD430

Some portable GPS units reduce receiver sensitivity as cell voltage falls toward the low-voltage cutoff threshold. On the GPD430, this can show as a degraded position fix or a wider accuracy circle before the battery indicator shows critical. The receiver draws more current during active satellite tracking than in standby, which accelerates voltage sag on a weakened cell. If accuracy drops during navigation, check the battery voltage — below 3.5V under load is the point where sensitivity reduction typically begins.

GPD430 shutting off without a low-battery warning

This happens when the fuel gauge or voltage-threshold indicator loses calibration after a battery swap. The device's shutdown threshold is hit before the visual warning has a chance to trigger. To recalibrate the indicator, charge the new cell to full, then run the GPD430 through one complete discharge-to-shutdown cycle on active navigation. After one full cycle, the low-battery warning should appear at roughly 3.6V before the unit cuts out.