I'm kind of new to notebook computers, so I was curious when I read about how the MacBook Pro's internal battery can hold like 1000 charge cycles avg. before needing to be swapped. I want to buy a MBP and would plan on taking it on the road with me, but that will not be frequently, so more often than not it would sit on my desk connected to AC power. My question is if you leave a MBP plugged in for long periods of time does that hurt the battery life? Like is it constantly charging and draining, or does it just not use the battery unless the magsafe is detached? Cause you can't just take these batteries out like you can with some other notebooks.. Thanks!