i dont want this to be a big thing. no tech exp here but i have never used my MBP on battery. from day one only used acdc.. when i go to settings - electric saver (?) or energy? it says battery 0% replace.. and the indicator in menu bar shows running on acdc and if i unplug mbp shuts down immedately... cuz this and other reasons going to genuis bar next week.. still under full warranty but i am freaking out about it.. whats the worse that could happen? what do you think is wrong with battery?