Originally Posted by bdjaddy
I've had mine for about a couple months and works very well, although I have had the same issue when the battery loses power when not in use.
I could be mistaken but I think this is to preserver battery life. If the battery isn't used for a while and is on the charger, it'll let some of the charge go in order to extend the life of the battery. If it is kept at max charge all the time it will reduce the overall life of the battery.