Magellan RoadMate 1700 Replacement Battery 3.7V 750mAh

Magellan RoadMate 1700 — 3.7V Li-ion Replacement Battery (2793801J3)

This is a 3.7V Li-ion 750mAh replacement cell for the Magellan RoadMate 1700 portable GPS navigator. It fits the internal battery slot directly and restores power to the unit when the original cell can no longer hold a usable charge. Rated at 2.78Wh, it matches the voltage and capacity spec of the factory-fitted battery.

• RoadMate 1700 fit: This cell matches the voltage rail and physical footprint the RoadMate 1700 requires. The connector and BMS communication line align with what the unit expects — the device charges and reads battery state normally after installation.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the RoadMate 1700 platform. The BMS negotiated correctly, the charge indicator tracked accurately, and the unit did not flag any battery fault.
• Cold-start behaviour after fitting: After fitting this cell, power the GPS on outdoors and let it acquire a satellite fix before use. A full power interruption forces a cold start — first fix typically takes 5–10 minutes while the unit downloads fresh almanac data. Subsequent warm starts are much faster once that data is cached.

GPS accuracy reduced at low charge on the RoadMate 1700

Some GPS units step down receiver sensitivity as voltage drops, trading position accuracy for power conservation. On the RoadMate 1700, this shows up as drifting position or slower route recalculation when the battery indicator reads low. A degraded original battery that sags under load accelerates this effect — the unit sees low voltage even when the indicator suggests charge remains. Replacing the cell eliminates the sag and restores full receiver performance.

RoadMate 1700 shuts off without showing a low-battery warning

This happens when the battery indicator is no longer calibrated to the actual cell's discharge curve. The device's voltage threshold for shutdown can be hit before the visual warning triggers — especially on an aged cell with a steep discharge curve at the tail end. The fix is to charge the replacement cell to full, then let the unit run through one complete discharge cycle so the firmware can re-anchor its voltage-to-percentage mapping. After that cycle, the low-battery alert reappears at the correct threshold — typically around 3.5V.