My battery health is at 40% after 260 cycles and it's gone as low at 10% sometimes. Also, sometimes, the amount left indicated by the computer is false and i can run past 0%. ALSO, the biggest issue is that my computer turns off instead of sleeps when the battery runs out. I did not calibrate it for a long time, but then about a month ago I calibrated it 3 times in one week and it got even worse. Can I get my battery replaced by Apple? I got it replaced once under my standard 1 yr warranty but now I'm under Applecare and one of my friends said that batteries werent covered under Applecare and the she had to just buy a new one.