Anybody know which model battery the Unibody Polycarb Macbook used? I seem to find a whole slew of mixed results, and it doesn't help that there was an Aluminum Macbook to join the mix. (although that battery was silver, while the one I need is black) Also, anybody know if the Unibody Macbook shares a battery with the Unibody Macbook Pro? I doubt it, since the dimensions are a tiny bit difference, but would really like to figure out which battery I need for sure. Thanks!