I was using Google Navigation on a Droid the other day while it was plugged into a USB car charger, after a while I noticed that the battery was actually draining, though very slowly. It took it about 30 minutes to go down by 10% (from 90% to 80%). I was able to recreate this in two different vehicles using two different chargers. I don't remember this happening before and I was thinking it might have started after the most recent maps update. My main charger is the Belkin micro and output is at 1A (1000mA), so that shouldn't be the issue. Anyone else having this problem?