I killed the battery on my old laptop by using it plugged in only for at least a year without ever unplugging it. Lesson learned.
So with this laptop – which I use in the office 10 hrs a day/5 days a week – I use it unplugged from time to time (maybe for 3 hours once or twice a week) in the hopes of not killing it. And, every month or two when I bring it home or on the road with me I’ll also used it unplugged for an hour here and there. Is my present routine sufficient to preserve the battery life?
Related question: when one considers all the incredible technologies in the world and all the vast monetary incentive to constantly develop better and better technologies, batteries are apparently one archaic technology for which people have had great difficulty figuring how to make improvements, wouldn’t you agree? They’re big, they’re heavy, they have short lives, etc. What’s the deal? Why can’t someone invent a better (not incrementally better, but fundamentally better) battery?