So I got my Prime today, charged it, but I had to leave for work. Before I left it was at 99%, but when I returned 4 hours later, it was still at 99%. After looking online and reading the manual, I'd like to point out something most of you guys probably know already, the charger only charges the unit when its below 95%. So I'm letting all the new guys know that do not read the manual unless there's something wrong. Also, just to add. Charging over USB/laptop is slower, and you need to keep your TF Prime off (not standby). Cheers.