I bought myself this Acer Aspire 6530 for Xmas and glad I did. It provides me with some entertainment while I recuperate with this broken leg. My question is this, is it bad to not use battery power very often, it is plugged in 99% of the time. Will that shorten the batterys life? I know they are expensive so I don't want to have to buy one in case I do have to rely on it.