Magellan RoadMate 3045 Replacement Battery 3.7V 720mAh

Magellan RoadMate 3045 Series — 3.7V Li-ion Replacement Battery (BP-LP720/11-A1B)

This is a 3.7V 720mAh Li-ion cell for the Magellan RoadMate 3045, RoadMate 3045-LM, and RoadMate 3045-MU portable GPS navigators. It matches the OEM part number BP-LP720/11-A1B and fits the same connector and housing as the original. Capacity is 720mAh (2.66Wh), identical to factory spec.

• RoadMate 3045, 3045-LM, and 3045-MU compatibility: All three variants use the same cell format, voltage rail, and connector layout. The 3045-LM and 3045-MU add lifetime maps and traffic respectively, but the battery circuit is unchanged across the series.
• Bench tested on actual hardware: We ran this cell through charge and discharge cycles on the RoadMate 3045 platform. The BMS accepted the cell without error, charged cleanly to 4.2V, and the device held the display on through active navigation without voltage sag or unexpected cutoff.
• First satellite fix after a battery swap: After fitting this cell, power the unit on outdoors and let it run until it acquires a satellite lock. The GPS performs a cold start following any full power interruption — first fix takes 5–10 minutes compared to under a minute on a warm start. Do not test indoors and assume the unit is faulty.

Saved routes and POIs disappearing after battery replacement

The RoadMate 3045 stores some navigation data in battery-backed RAM. When the original cell dies completely or is removed, that volatile memory loses power and clears. Saved home addresses, favourites, and recent destinations may not survive a full power-loss event. Maps stored on internal flash are unaffected — only RAM-resident data is at risk. After fitting this replacement, re-enter any saved locations through the device menu.

RoadMate 3045 shutting off without warning before the battery indicator hits zero

This happens because the on-screen battery gauge is calibrated to the original cell's discharge curve. A new cell — or an aged original — can have a slightly different voltage curve, so the device hits its low-voltage cutoff threshold before the visual indicator catches up. The unit shuts off abruptly rather than showing the empty-battery warning. Run two or three full charge-to-discharge cycles and the gauge will recalibrate. After cycling, the cutoff and the indicator should align at around 3.0V.