its like your rc's if you got a good battery (nmih or whatever) your fine.. i would fully charge and fully discharge a few times just for good measure.. but if you have a nicd battery then you should treat it as one.. but if you have the ability to plug it in the do so.. most of the new laptops have a processor throtle when it is on battery to save battery life.. when it is plugged in its full speed all the time.. when its on battery it speeds the proccesor up when you need it (opening programs, multitasking) but it does have a bit of a lag when doing this.. its a compromise between speed and power, and battery life.. also mine dims the lcd (which i hate) to save power to..