Originally Posted by
leob1
Is there anyway to tell when the batteries need replacing? Or if they are dead?
The system connects to a Gramin. I have a 520 that reports the lowest batteries power It also flashes a warning when a battery gets really low. Plus, teh rear gets more shifts than the front, so runs down sooner. If that happens you just swap them. Or you can carry an extra battery. They are pretty small and light.