About this replacement
Magellan Crossover / 2500T — 3.7V Li-ion Replacement Battery (37-00031-001)
This 3.7V 1800mAh Li-ion cell replaces part number 37-00031-001 in the Magellan Crossover and 2500T portable GPS navigators. It restores power to the internal battery that runs the GPS receiver, display, and onboard map storage. Capacity is 1800mAh (6.66Wh) — matching the original specification.
- Crossover and 2500T compatibility: Both models share the same battery bay dimensions, connector pinout, and 3.7V nominal voltage rail. The BMS handshake is identical across the two, so one cell covers both without modification.
- Bench tested on actual hardware: We cycled this cell through charge and discharge on the Crossover platform. The BMS accepted the cell without error flags, and the charge circuit terminated correctly at full capacity.
- First-fix satellite acquisition after installation: After fitting this cell, power the GPS on outdoors and let it run until it acquires a satellite fix before driving. The device performs a cold start after any full power interruption — first fix typically takes 5–10 minutes. Subsequent warm starts run under a minute once the almanac is cached.
Why the Crossover shuts off without showing a low-battery warning
The Crossover reads state-of-charge from a voltage curve calibrated to the original cell. When a degraded original battery is replaced, the firmware's voltage-to-percentage mapping may be out of sync with the new cell until it completes one full charge cycle. The device can hit its hardware cutoff threshold — typically around 3.0V under load — before the on-screen indicator reaches the warning zone. Run one full charge from flat to 100% after installation to let the display track the actual charge curve accurately.
Saved routes and POIs missing after battery swap
On the Crossover, some user-saved routes and points of interest are held in battery-backed RAM rather than written permanently to flash. Removing the battery cuts power to that memory, and those records are lost. Base map data and pre-loaded POI databases survive because they sit on flash storage. Before swapping the battery, export any custom routes via the USB connection to a PC — that is the only way to recover them after a full power removal.