Yesterday I called Apple about my new MBP (15" 2.4). I have it on AC power at home, I flip the lid down around midnight with the battery at 100% charged. The next day after work I open it up to find the charge way down. Apple suggested I calibrate the battery which I did yesterday. So last night it hit 100% and I closed the lid, the power LED began doing it's usual "snore" dimming thing. Eleven hours later, I return and it's at 78% full. Does eleven hours in sleep really take 22% of the battery??? Before I calibrated it had lost around 75% of battery after being in sleep mode for 36hrs roughly.