i dont know if this helps at all, but my MB 2008 before i sold it last week was at 320 something cycles on about a 2-2.5 hour charge but my new MacBook 9400m is on 140 cycles still at 97% capacity so i would be concerned about my battery too, maybe consider a replacement or at least ask your local apple store about it, but to say it's defective might be a bit of a stretch, nearly 3 years old, pretty good time to consider replacing a battery and im also pretty confident apple care wont help at all
sorry if thats useless to you but thought it might be of some use...