I just got my first macbook pro and am curious about battery health. I use my macbook pro for 2 lectures totaling 4hours a day, 2 days per week and return home with about 40% battery each time. Is it better to run the battery down to reserve each time before plugging in or should I plug in when I first return home. Additionally, On the other 5 days per week my laptop stays home as I do not wish to take my macbook pro to laboratory settings (dangerous chemicals and all) at which time is it better to leave the macbook pro plugged in 100% of the time since the battery is cycled when attending lecture? And when away for long periods of time (lab/work) do you guys suggest sleep mode or a total power down of the macbook pro?