Well, same problem over here. Used it last night til it was empty.
The next morning tried to recharge it... nothing... apple logos show's when on ac..
en it shuts off again. On usb it does nothing.
When i press the home and sleep buttun a long while, is see the restore mode image.
Also on this mode... it's not charging.
Think the lion is fully discharged. i will try to charge the battery with a slightly bigger voltage..... if that doesn't work i have to order a new battery pack..