(fore the record I have an iStat program I am basing some of this information off of.) I have a early 2008 15'' macbook pro. The battery was lasting roughly 2 hours (70ish% health according to istats) until a little while back. For about a week I used my mom's charger for her 13inch 2009 MBP, which I dont think my MBP liked very much. Ever since then it hasnt been doing so well. It tends to lose the last 30% of its charge almost instantly. According to istat, it is at about 32% health at the moment. Should I just take it to apple? Will they be able to gauge its health and give me a replacement? Apple care runs out for me in June.