Firstly, I've taken a look at some battery threads here, but this issue seems to be more alarming. My sister's mid-2007 Macbook Pro 15" has a battery health of 19%. This sounds normal, except there have only been 144 battery cycles. From my understanding, the battery life usually doesn't significantly drop until ~300 cycles (at which one could expect around 80% health). She usually keeps the MBP plugged in, and does not use it much on battery power. Lately, she's been trying to use it on battery power, only to have the charge percentage drop rapidly until it gets to around 70%, at which point the computer abruptly turns off, without a low battery indication. coconutBattery indicates that the battery health is at 19% with 144 cycles; iStat Pro confirms this. coconutBattery reports a battery capacity of 1048 out of 5600 mAh. As we were using it on battery, the capacity dropped to 16% (916 / 5600 mAh). 27 months is the reported battery age. I know it is normal for battery capacity to drop as its age and usage increases, but this much in only two years? Right now we are calibrating the battery, in hopes that it will help. Is there anything we can do without buying a new battery? Will the Apple store take a look at it (no AppleCare)? Thanks.