About this replacement
Magellan RoadMate 2000 / Maestro 3100 — 3.7V Li-ion Replacement Battery (37-00030-001)
This 3.7V Li-ion cell at 1250mAh (4.63Wh) replaces the original battery in the Magellan RoadMate 2000, RoadMate 2200T, RoadMate 2250T, and Maestro 3100 portable GPS navigators. These units share the same internal battery bay dimensions (50.56 x 36.03 x 7.12mm) and connector, so one cell covers all four models. Fits directly behind the rear cover without modification.
- RoadMate 2000 / 2200T / 2250T / Maestro 3100 platform: All four models run the same 3.7V power rail with an identical connector footprint and BMS communication handshake, which is why a single cell services the entire group. Swapping between models does not require a different part number.
- Bench tested on actual hardware: We cycled this cell through charge and discharge on the RoadMate platform and confirmed the BMS accepted full charge without triggering an over-voltage cutoff. The protection circuit also tripped correctly at the low-voltage threshold before the cell reached an unsafe state.
- Cold-start satellite acquisition after swap: After fitting this cell, power the unit on outdoors and let it sit in an open-sky location. The GPS performs a full cold start after any complete power interruption — first fix can take 5–10 minutes versus under a minute for a warm start. Do not expect immediate navigation readiness straight out of the box.
GPS accuracy reduced at low battery on the RoadMate 2000
When cell voltage drops below approximately 3.5V, some RoadMate units reduce receiver sensitivity to conserve power. The GPS antenna still acquires satellites, but position accuracy can degrade and the unit may lose fix in areas with partial sky coverage — under tree canopy or in urban canyons. This is not a hardware fault — it is a deliberate firmware power-saving response. Keeping the battery at a healthy charge state maintains full receiver sensitivity.
RoadMate shuts off without warning before the battery indicator hits empty
The on-screen battery gauge in these navigators is calibrated against the original cell's discharge curve. A new cell with a slightly different curve means the indicator can read one bar remaining while the actual cell voltage is already at the cut-off threshold — around 3.0V. The unit then shuts down without a low-battery alert. After two or three full charge and discharge cycles, the firmware recalibrates and the indicator becomes accurate again. Run the unit on battery until it shuts off naturally, then charge fully — repeat this twice to reset the gauge.