About this replacement
Magellan RoadMate 2230 / 2230T-LM — 3.7V Li-ion Replacement Battery (338040000014)
This 3.7V, 750mAh Li-ion cell replaces the OEM battery in the Magellan RoadMate 2230 and RoadMate 2230T-LM portable GPS navigators. It matches the original 338040000014 part number and fits the same 50.55 × 36.39 × 5.73mm footprint. Swap it in when the unit no longer holds a charge or shuts off during navigation.
- RoadMate 2230 and 2230T-LM fit: Both variants share the same internal battery bay, connector pinout, and charge circuit. One cell covers both.
- Bench tested on actual hardware: We cycled this cell through charge and discharge on the RoadMate platform. The protection circuit triggered correctly at low-voltage cutoff and accepted a full charge without fault flags from the device.
- First fix after power interruption: After fitting this cell, power the unit on outdoors before driving. A cold start — triggered any time the GPS loses all power — can take 5–10 minutes to acquire a satellite fix. Subsequent warm starts drop back under a minute once the almanac data is rebuilt.
Why the RoadMate 2230 shuts off without a low-battery warning
The RoadMate 2230 reads remaining charge by measuring cell voltage. After years of cycling, the original cell's voltage curve flattens — the unit reports adequate charge right up until voltage collapses past the cutoff threshold. The on-screen battery indicator never catches up, so the device just switches off. A fresh cell restores a predictable voltage curve, and the indicator behaves as expected again.
GPS accuracy drops during active navigation at low battery
At low cell voltage, the RoadMate reduces power to the GPS receiver module to protect the remaining charge. Lower receiver power means weaker satellite signal processing, which degrades position accuracy — you may notice the cursor drifting or lag in turn-by-turn updates. This is not a software fault. Keep the cell above 3.6V during active use to maintain full receiver sensitivity. Charging via the vehicle adapter while navigating is the most direct fix.