I have found this site: http://www.apple.com/batteries/notebooks.html .... which basically says to be sure to actually use the battery from time to time to "keep the electrons in it moving". This is my only computer and I use it daily. How often should I fully discharge my battery? Or should I just make sure I use it unplugged from time to time? How often? Is it normal that sometimes while my MBP is plugged in, it only maintains the current battery level rather than charging it to full? Is this some kind of OS X battery management system (or does my comp have a problem) ? Thanks for helping a n00b switcher. I've had the computer for 4 days now and I'm loving it. Since day 1 was over, its been a constant enjoyment as I discover all the neat features and efficiencies built in.