Again, there was a report on the News Group from a user who lost all the waypoints and routes after replacing the main batteries. We did not have 10 years to confirm Magellan s claim, but leaving the unit overnight with the batteries removed, did not affect anything. The memory backup was doing its job properly. However, leaving the unit for few days with the batteries removed caused the reset of the internal clock and the unit had to be re-initialized after the batteries were installed. It is possible that storing it for longer periods of time without the batteries, could cause the loss of user waypoints.
Battery life is a topic of many discussions.
In this respect, the 315 can hold its own. It may be considered a nuisance by some and a benefit by others it will depend on how far one has to walk to get a new set. It utilises 4 contact points on the back of the unit. The connector of the external power cable attaches directly to the back of the receiver, or can be mounted to a bracket. If the bracket is used, the unit can be simply snapped into it and the connection is automatically made.