I've had to replace battery at least once and buy a new power adapter for each mac laptop I've had since and including the tibook, which is a white macbook and

I've had to replace battery at least once and buy a new power adapter for each mac laptop I've had since and including the tibook, which is a white macbook and a 15" mbp. The 5 or so different powerbooks I had never needed replacement anything, but maybe I used them less hours/day.