So I may be buying my friend's 2010 13 inch macbook pro off of him in the next couple of days because he has run into some financial trouble. The two of us both had, and I still do have, the original Macbook and had run into issues with our batteries. Since then we've taken up the unplugging when 100% and letting it die before plugging it in kind of care. He tells me that the new ones have internal batteries and can't be "unplugged" but the macbook pro takes care of it so he never has to unplug his laptop for fear of the battery losing its zero point. Is this true? I'm only asking because I want to know if this is an issue I'll have to deal with down the road since the week or two he's had it he has pretty much left it plugged in.