Q: Battery life dropped considerably on Mountain Lion.

Well that puts that theory to bed then thanks for the heads up

Just to add my name to the list. Bought a MacBook air 2012 with Lion preinstalled. Upgraded for free to mountain lion. Noticed battery life dropped significantly for about 40%.

Battery drained more especially when mail app was opened.

SMC reset didn't do squawk. Apple genius' need to put on their thinking caps on this one.

Yeah i must say, it was the case for me too on early 2009 macbook pro 17 inches, battery dropped about 40 Percent from lion to mountain lion and my battery is replaced new and it was working well with lion.

Just opened Air, checked activity monitor, checked mail reset to check mail manually, opened Safari & came to this page all up not 5 minutes battery dropped from 75% to 69% in that time with those few tasks ... not good Apple not good

WOW, so ladies and guys, check this out! MBP Santa Rosa, not only did the battery usage doubled, it ALSO DRAINS THE BATTERY WHEN OFF at a arate of 15% every 7 hours! I obviously tried the SCM and power settings reset (unplug mag, remove battery, and press Power for 5 seconds). NO effect.  Also calirated (full off, sleep a few hours and full charge). No effect. I thought my new A1175 battery was defective, inserted my old one and same issue!!! I tested it with Sleep, and it also depleted 15% in two hours. Overall, when in use, with 80% brightness and just web activity, ML drops 0.75% per minute, or nearly empty within just under 2 hrs. With programs such as iMovie or iPhoto, it is well over 1% drop a minute. This is no bloat or ON factor. Something is eating the battery juice on or off. Have any of you tested the battery levels after several hours off (and no mag adaptor?)

WOW, so ladies and guys, check this out! MBP Santa Rosa, not only did the battery usage doubled, it ALSO DRAINS THE BATTERY WHEN OFF at a arate of 15% every 7 hours! I obviously tried the SCM and power settings reset (unplug mag, remove battery, and press Power for 5 seconds). NO effect.  Also calirated (full off, sleep a few hours and full charge). No effect. I thought my new A1175 battery was defective, inserted my old one and same issue!!! I tested it with Sleep, and it also depleted 15% in two hours. Overall, when in use, with 80% brightness and just web activity, ML drops 0.75% per minute, or nearly empty within just under 2 hrs. With programs such as iMovie or iPhoto, it is well over 1% drop a minute. This is no bloat or ON factor. Something is eating the battery juice on or off. Have any of you tested the battery levels after several hours off (and no mag adaptor?)

So no one is imagining things, no one is overusing their system, or has anything unecessary on (such as bluetooth). It is just a bad bad blunder by Apple's relatively great engineers.

Didn't think I had the heat issue but just caught the metal between screen hinge and keyboard and bloody **** thats warm! just keeping mine connected to the cord now, until an update to fix all this stuff is released

WOW, so ladies and guys, check this out! MBP Santa Rosa, not only did the battery usage doubled, it ALSO DRAINS THE BATTERY WHEN OFF at a arate of 15% every 7 hours! I obviously tried the SCM and power settings reset (unplug mag, remove battery, and press Power for 5 seconds). NO effect.  Also calirated (full off, sleep a few hours and full charge). No effect. I thought my new A1175 battery was defective, inserted my old one and same issue!!! I tested it with Sleep, and it also depleted 15% in one-two hours. Overall, when in use, with 80% brightness and just web activity, ML drops 0.75% per minute, or nearly empty within just under 2 hrs. With programs such as iMovie or iPhoto, it is well over 1% drop a minute. This is no bloat or ON factor. Something is eating the battery juice on or off. Have any of you tested the battery levels after several hours off (and no mag adaptor?)

So no one is imagining things, no one is overusing their system, or has anything unecessary on (such as bluetooth). It is just a bad bad blunder by Apple's relatively great engineers.

Mine doesn't do that...yet.

Yes same here!   But I was involved in the trail SEED and didn't have the problem.

Battery drains quickly even if I am doing nothing

me too, my mac has been on for 10 minutes and i've already gone down 8%. I can literally watch the percentage go down as i type. Weak sauce. Fix soon. Who knew the cloud was such an energy sucker.

BTW, late 2011 MBP. I'm scared to try photoshop or maya without plugging in.

eddyr wrote:

 

I am wondering if this problem is not caused by Mountain Lion at but maybe the Firmware upgrade some portables had to install for PowerNap to run. Not sure of course but it seems laptop related and only most that had to install this firmware upgrade what's the thoughts on that ? Or are some of you having this same problem and haven't installed the firmware upgrade ?

Most of the affected machines are not capable of 'Powernap'. This feature only works on newer models.

Apple only supports PowerNap on 2011 MacBook Airs and beyond as well as the 2012 Retina MacBook Pro.

http://support.apple.com/kb/HT5394?viewlocale=en_US&locale=en_US

I didnt get the email - but i did get a phone call from Apple based on my original post on here. I guess they have al info based on my login to this forum.

They are collecting info from as many users as possible right now. The process took about 45 minutes - I had to download a data capture program and also email 3 files to the support person. I was instructed to upgrade dropbox or unistall it - which i did. I was told it was a commononality between many users. How many of you are using dropbox?