June 5th, 2011, 10:42 PM
Moderati ergo sum
Join Date: Jun 2010
Device(s): Nexus 4, Galaxy S II,
Nexus 1 (retired),
Thanked 11,119 Times in 6,073 Posts
Welcome to the forums.
There could be a lot of reasons for rapid battery drain, but since you said it was charging via USB, you might consider that you have a bad cable, especially if the A/C charger worked.
If a battery is completely depleted, it will take a while to charge it fully.