About this replacement
Garmin Nuvi 1490TV / 2585TV — 3.7V Li-ion Replacement Battery (361-00045-00)
This 3.7V, 1800mAh lithium-ion cell replaces the original battery in the Garmin Nuvi 1490TV and Nuvi 2585TV portable GPS navigators, as well as the GDL 39 datalink receiver. It matches the OEM part numbers 361-00045-00 and 361-00045-20, fitting the same 60.00 × 41.90 × 7.30mm footprint and connector orientation as the factory cell.
- Nuvi 1490TV and 2585TV platform fit: These two navigators share the same battery bay dimensions, connector pinout, and 3.7V power rail. The GDL 39 datalink receiver uses the same cell for the same reason — identical voltage requirements and physical envelope across the platform.
- Bench tested on actual hardware: We ran this cell in a Nuvi 1490TV through full charge and discharge cycles. The BMS communicated correctly with the unit's charge controller, reaching 4.2V at full charge without triggering any protection fault. Discharge cutoff activated cleanly at the correct low-voltage threshold.
- Cold-start behaviour after fitting: After fitting this cell, power the unit on outdoors and let it acquire a satellite fix before driving. A full power interruption forces a cold start — first fix typically takes 5 to 10 minutes. Subsequent power cycles will lock much faster once almanac data is cached.
GPS accuracy reduced at low battery on the Nuvi 1490TV
When the Nuvi 1490TV's battery drops below a certain charge level, the unit reduces power to the GPS receiver to slow overall drain. This cuts signal sensitivity, which can widen position error — especially in urban canyons or under tree cover. The effect is gradual and easy to miss until routing starts producing odd results. Keeping the battery above 3.6V during active navigation prevents the receiver from entering its reduced-power mode.
Nuvi 1490TV shutting off without a low-battery warning
After a battery replacement, the on-screen battery indicator may not be calibrated to the new cell's discharge curve. The unit reads remaining charge based on voltage thresholds stored from the old cell, so the visual warning can appear late — or not at all — before the BMS hits its cutoff and drops power. To recalibrate, run one full charge-to-discharge cycle without connecting to vehicle power. After that cycle, the indicator will track the new cell's curve accurately and give warnings at the correct threshold.