Hi I just got my macbook not too long ago and for right now am using it as just a desktop. I completely drained the battery and then completely charged it like apple says to and it charged to 100%. I haven't taken it off the outlet since. But yesterday morning before we left it said 99% battery charge while still plugged in? I turned it off but left it plugged in now tonight I just turned it on( we were gone that whole time) and its saying 98% battery. This whole time its not been taken off of ac power and just been left on my desk. Anyone have any clue as to what might cause that? Its really wierd.