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Battery life dropped considerably on Mountain Lion.

520552 Views 3,396 Replies Latest reply: Oct 28, 2013 5:38 AM by CT RSS Branched to a new discussion.
  • iPaulMorrison Level 1 Level 1 (0 points)
    Currently Being Moderated
    Jul 30, 2012 2:09 PM (in response to Sushant)

    I would like to suggest this is not connected to certain Applications whatsoever. I don't use Mail or Safari.


    With a 100% charge, half brightness and keys completely off. I am estimated 1:36. This is even worse that the 3 hour estimate I had 2 days ago. This was with no apps running.


    Before ML I could run Firefox, iTunes & uTorrent. Same settings in terms of brightness and get about 6 hours.



  • beken911 Level 1 Level 1 (0 points)

    I have found solution that works for me.

    So basically first time i upgraded from Lion to Mountaion Lion, but i had troubles with battery. Then

    i tried to do clean install and now it works perfectly as with Lion.


    Shortly: Try clean install with Mountain Lion. It should help.

  • welysson Calculating status...
    Currently Being Moderated
    Jul 30, 2012 9:14 PM (in response to beken911)

    Hi beken,


    You mean, uninstall the system completely and install the montain lion, like format the laptop?


    My battery drop off at least 40% of performance, now it takes no more than 2 hours to discharge. Before the ML it was about 3:30 to 4 hours (A1378 13")

  • beken911 Level 1 Level 1 (0 points)
    Currently Being Moderated
    Jul 30, 2012 9:58 PM (in response to welysson)



    Before that my battery drained in one night even at sleep mode. Now its work perfectly.

  • Courcoul Level 6 Level 6 (11,150 points)
    Currently Being Moderated
    Jul 31, 2012 1:04 AM (in response to beken911)

    Just a thought. Has anyone with this issue tried to completely and totally obliterate all the myriad caches found in these systems, and see if that cures it? The freshly released v2.6.0 OnyX should be able to do so in its Cleaning section.



    Me? I'm sticking with the old Fat Cat for now... But I have lots of confidence in you guys!

  • Arun Lal Level 1 Level 1 (5 points)

    I am not sure I like the idea of changing my usuage pattern from before to conserve battery life suited to ML. Apple didn't issue any warning (maybe in the fine prints) that installing the new operating system could invalidate a few of the machine features stated at the time of purchase.


    For me it is a serious flaw, and I would be holding back from updating my second mac until a patch is available.

  • stevo_c Level 1 Level 1 (0 points)
    Currently Being Moderated
    Jul 31, 2012 3:24 AM (in response to Arun Lal)

    There have been a bunch of replies on this thread tellign users how to "work around" a problem that should be down to apple to fix.
    We should not have to fix this at user level. This is Apple's responsibility!

  • iPaulMorrison Level 1 Level 1 (0 points)
    Currently Being Moderated
    Jul 31, 2012 4:07 AM (in response to stevo_c)

    Is anybody else seeing a decline in battery life every time they try? I started with 6/7 in Lion, 3:30 upon updating. 2 hours, then 1:30 yesterday.


    Fans also now sound like 747 turbines when I unplug the battery.

  • Kriswin Level 1 Level 1 (90 points)

    Here's a simple explanation.


    If you haven't done a clean install, some programs may still be on your Macbook. Those programs may not be compatible with OS X Mountain Lion. I would update all of them first to see if it's a problem with your incompatible files.


    If and only if the issue continues to happen, do a clean install. If at that point [after clean install] the fans are still running crazily and the battery life is terrible, I would continue bothering Apple through the telephone to make sure that they come up with a fix.


    Many users on other discussions have found that the problem with fans and battery is linked to incompatible programs [namely Skype, ESET Antivirus, among many other apps]. Download the latest version / update.

  • iPaulMorrison Level 1 Level 1 (0 points)
    Currently Being Moderated
    Jul 31, 2012 4:28 AM (in response to Kriswin)

    Well I think I found the culprit of the fans.....Firefox Plugin Process (Shockwave Flash) is taking up anywhere between 40 and 60% CPU....everything else is below 10%.

  • Arun Lal Level 1 Level 1 (5 points)

    I don't have a problem with the fan. My MBP is still new and I haven't installed anything after M Lion. I would expect the battery to behave as it did before. A new OS brings new features but shouldn't take away critical things as battery life.

  • Kriswin Level 1 Level 1 (90 points)

    Have you tried updating Firefox?

  • iPaulMorrison Level 1 Level 1 (0 points)
    Currently Being Moderated
    Jul 31, 2012 4:42 AM (in response to Kriswin)

    Everything is completely up to date. Battery health is 100% and is charged 100%.


    This is what I get...


    Screen Shot 2012-07-31 at 12.41.26.png

  • Arun Lal Level 1 Level 1 (5 points)

    I remember this SWF problem  on my PC that came with the newer Firefox. It used to put the fan in overdrive. Try using Chrome or Safari instead and see if the the battery life/fan problem improves. My guess is that it will but only the fan issue. Good luck.

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