I just bought a 13" MBP a few days ago and wanted to know how best to not mistreat the battery. I currently use It plugged into an outlet with an external monitor connected and the lid closed, It says it has 97% battery life and is fully charged, the first day it was 100% and then after a few hours of work 99 and today 97%. Is this because I haven't calibrated the battery yet? is it best to leave it unplugged or plugged during the night? If anyone has any good sites with battery info I would much appreciete it, thanks.