My MacBook's (late 2008, unibody, 13") battery has just become very bad. I also have a MacBook Pro (mid 2012, 15") which has a still-ok battery. Now, since I take my MacBook (the old one) everywhere I would like it to have a good battery life.
Can I swap the batteries of the two Macs? I saw that the battery of my old MacBook has 45Wh and the newer one has 77.5Wh, is that going to be a problem?