My MacBook CD battery has a bulge going the length of it. It doesn't really bother me, except for the fact I'm a bit worried it's going to explode. My MacBook is out of warranty, but this battery was given as a replacement some time back. Even if it is out of warranty, do you think a Genius would look at it to make sure it's safe? I'd hate to buy a new one when this one's still good, but even worse, I'd hate to come home to a melted MacBook. If it matters, it's a CD 2.0Ghz.