I have a 2.2 GHZ macbook pro. This is the model before the brand new redesign and before the update in late 2008. This Mac is amazing, however recently I noticed about a month ago that I could not use this on battery like I could when I first got it and up until a month ago. This Mac is about 1.5 years old. The problem is that when I unplug the power adapter to run on battery, the computer just shuts off without any warning after about 20 minutes or less. I timed it a couple times to see if it was a consistent problem. I charged it fully and then unplugged the power adapter and ran a timer. i got 19 minutes, 17 minutes and 21 minutes of power before it died. iStat Pro says that my battery health is 92%, I have 26 cycles, and when i unplug it it says I have like 3.5 hours remaining. This battery is the original battery and has never gave me a problem. It used to read 3.5 remaining and give 3.5 hours until it died. It also gave me a low power warning before it died which it now does not. It shows the power as almost full and then shuts off without warning. I have applecare and am covered but I just wanted to see who else was having this problem and if it was curable by just reinstalling leopard. Thanks for any help.