I just got a new 15" Powerbook. What should the battery capacity be when I put in ioreg -l | grep -i IOBatteryInfo in Terminal? I get "Capacity"=4537. Is about 3 - 3 1/2 hours battery life with it set to better battery life with bluetooth of and airport on normal? Also, is it normal for it to be very hot in the back left corner after it has been used for a couple hours?