MacInside wrote:
This didn't help me:-( I just installed Mountain Lion a clean installation.... I took me hours to do this with no better results:-(
Well, Try to do SMC Reset than PRAM Reset the battery will get 4 hours real time use and i notice it's not good as in Lion but it won't drain faster if you do the two resets here is there below links
This one PRAM Reset
http://support.apple.com/kb/HT1379
This one SMC Reset
http://support.apple.com/kb/HT3964
Please remember you won't able to get good result like the one in Lion as this OS is still not fixed properly for the portable device, You may only get 3-4 hours of real time use after resetting SMC and PRAM.
I have also contacted AppleCare they mentioned the same thing that i said including Clean Installation, Resets etc but the result of the battery returned to normal but not good as in Lion and we'll have to wait and see what is Apple doing on 10.8.3 if it's fixed than you should upgrade your OS to the latest version at least i'm not sure if Apple is still mentioning this case or not as i didn't hear any words from them and they're saying that they didn't have any issue that's relating to Mountain Lion using Portable Mac devices and this issue affected thousands of users across the world.
I'm on the same side as you and i have nothing more to help to resolve this case and this is issue with OS. Hopefully Apple will start mentioning this issue 😉