So I just got my macbook pro yesterday 2.8ghz. quick question. I just read up on the battery calibration process on apples website. seems straight forward. just one question. after i let the battery drain and let it go into sleep mode, then wait 5+ hours, then charge it to full. can i use the computer when i start charging it to full? or does it have to be off while im charging it to 100%? thanks 