I have been reading about this and I'm still not sure which one is the best way to take care of the battery. Once it's full charged, should I unplug it or leave it "charging" instead? I've read many times that keeping it plugged in kills the battery faster, but I also read that some devices (MacBook pro I think) bring some kind of feature so when it is full charged, it doens't use the battery. So, what has Microsoft said about this? Thanks.