I'm starting to see this now. It's random. Two nights ago I powered it down when the battery was at 25% and plugged it into the charger it came with, using the supplied cable. The next morning (after about 8 hours) I checked and it was still at 25%. Last night, same thing, but at 70%; no change 8 hours later. In both cases I did a power down, waited until it was powered down, plugged it in, saw the simple battery graphic with the lightning bolt, then saw the graphic of the battery with the insides going up, which goes away after a second or two. I don't have the daydream thing on. Now this morning after an hour or so on the charger it's going up. Very strange. I hope it's software and the latest update fixes this.