I have a macbook pro 13", and the battery has died. I need to buy a replacement, so I checked apples website and found out that the model number on my macbook is either MC375xx/A or MC374xx/A, but I can't seem to figure out which one exactly. I was looking on Newegg, and the replacement batteries for those model numbers are sold separately, so I don't believe they are interchangeable. I was just wondering how to find out exactly which battery I need. Thanks.