I just picked up a LG vu cu920 off a buddy and he said all it needed was a new battery, to me it seems that it does. Well i left it on during work with no sim in it, when i showed up it was still on ??? When i put my sim in it, it wont even boot up like the battery is dead, it will boot up if its plugged in though and will take like 3 secs for "charge complete".