Q: Battery life dropped considerably on Mountain Lion.

Did many folks get the "service battery" message after the install or is that just a much rarer issue?  Just curious.

well, the battery usually won't start charging until it drops down below 95%, so although it is 98%, it will still show up as charged.

same problem here. upgrading to Mountain Lion from Snow Leopard just killed my battery life on mu MBP mid-2009. A totally un acceptable bug. A real shame.

I have noticed this issue once I upgraded to Lion originally. I even mentioned it to a Genius once when I was haveing my iPhone replaced. He said he has never heard of any such issues. I am running a 2008 macbook aluminum body BTW. I even went to the extent of purchasing a new battery (Im sure we all know how cheap those are).With Mountain Lion I am luck to get an hours worth of use with out being tethered to the power cord.

No, I didn't get this message.

Battery state is: normal.

And my current consumption is about 800mA, lowest brightness, only Safari and Mail opened.

I had this issue shortly after upgrading to Lion. I replaced my battery back than but I have not seen it pop up with Mountain Lion yet.

Another article on the issue - indeed, mysterious:

http://arstechnica.com/apple/2012/08/mountain-lion-having-mysterious-effect-on-b attery-life-for-some-users/?utm_source=feedburner&utm_medium=feed&utm_campaign=F eed%3A+arstechnica%2Findex+%28Ars+Technica+-+All+content%29

Also just saw this post from someone from the above article - makes sense and will look into it:

"I had this happening to my mid-2010 MBP and I thought it might be the result of outdated HDD firmware. I updated the Seagate Momentus XT firmware to SD28 and that appears to have fixed things. This was not very scientific problem-solving though, and it could be total coincidence."

Mid 2011 MBA.  With Lion I would lose 1-2% overnight while in sleep.  With ML I'm seeing 7-8% per night drops.  Power Nap is turned off on battery, so that's not a factor.  I didn't make any changes to settings or add any apps since upgrading to Lion.

I haven't done a full discharge test to see if that time has changed.

I have observed a 33% drop in battery life. 13" MacBook Pro Late 2011? Let me know if I can help.

I have 50% drop in my battery , it is as if %=Min

I want to restore back to lion any one can help me please

I'm seeing an approximately 1%/minute drop in battery capacity when streaming Spotify.  That's more than twice as fast as under Lion.

not that rarer issue it looks like. I have now exact same problem after upgrading.

New Macbook pro retina. Lovely, fast - especiallly the battery drain! Getting about three hours on this. Not what I expected from a machine of this cailbre.

The Mountain Lion reinstall did nothing for battery life.  Losing about 1% a minute.