I have a 2.8ghz Intel Core 2 Duo unibody (early 09) macbook pro 15" running 10.5.8 with 4gb of RAM, purchased refurbished in June of last year no I didn't buy applecare, it was expensive (yes I know what's an extra $350 when you're spending 1400 blah blah), I know I should have, but it's too late so please try and give advice beyond taking it to the genius bar lately, maybe the past 2 months or so, my MBP has begun to somewhat randomly shut down and turn off at around 19-21%. after it shuts off, if I try to turn it back on, the optical drive, which previous to this made a quick and tight machine noise, that sounded completely normal and peppy - however, now it sounds like it's literally struggling to "turn over" and makes a much slower whirring noise and won't turn on. the computer will only turn on (after it's shut down randomly) if I first plug in the charger. it doesn't do this EVERY time it gets to around that % of battery charge, but it's becoming more frequent and starting to worry me any experiences like this? I've googled and found answers regarding everything from the battery to the logic board - now having typed out my situation and read it myself, it's plausible to me that it could be the battery - if it's not drawing enough power from the battery alone, but quickly turns on when plugged in - but I figure there may be other possibilities also thanks UPDATE: well, yeah this is probably not needed but I saw more people commented than I thought, so, it's definitely my battery. I used both coconut battery and system diagnosis or whatever it is... apparently my battery is at 30% health, or only 1000 mAh... not even been 2 years yet and just over 300 cycles, but what can you do. also I see that my battery read 75% health when I first posted this a little over a month ago (been out of the country). not really sure why it dropped so quickly? I've correctly calibrated my battery several times in hopes it would fix it, but no luck. anyway, i suppose i'll be buying a new battery. any suggestions for where to get one? is there a such thing as a higher capacity battery for my macbook? it sucks because otherwise the computer has been absolutely flawless, just this battery issue.