So...when I first got my mbp, I was getting about 3 hours battery life, even after "calibrating" my battery, once I put it under load with photoshop and dreamweaver, it dropped to about 2 hours rather quickly. In the past few days however, my fully charged battery life has gone up to about 3:40 to 3:20 even under load. Not that I'm complaining, but how can this be?