hi! i'm new to macrumors, as i just got a brand new macbook pro for college last month (with the free iTouch ). anyways, my laptop is less than a month old, but i've noticed when it's plugged in (i don't run on battery power), the battery percentage is going down. not the capacity, but just how much charge the laptop has. (excuse me if i'm using the wrong terms). and in about one-two weeks, the battery goes down past 95% and it starts charging itself. is this normal?