I have a Garmin Edge 800 and purchased a Oyama external battery pack that runs off of 2 AA batteries. My problem is that when I plug in the battery pack it charges the Garmin but will not let me use it. Is this characteristic of the Garmin 800 or did I get the wrong battery pack. I saw the following link
http://www.gomadic.com/garmin-edge-8...-extender.html has anyone tries this battery pack?