I'm picking up a new battery soon. Now, I leave my mbp plugged in 95% of the time. Rarely do I use strictly battery power. I suspect that my current battery is screwed because of this.... I try to remember to unplug the power and run it off just the battery, but I usually forget. With this new battery, would it be wise to just keep it out of the mbp, and only use it when I "need" to? Would it be a better move to just keep it plugged in without having the battery actually installed?