Mountain Lion OS X 10.8.2: Best Battery Life Since Snow Leopard

Posted in Apple News, Mac, OS X on 10/09/2012 by Chris Hauk


A little over a month ago, there were reports from many users that had noticed a significant decrease in battery life on their laptops after upgrading from Lion to Mountain Lion. While the first update, OS X 10.8.1 did improve battery life, new testing shows that the current developer’s seed of OS X 10.8.2 completely restores battery life back to pre-Lion levels.

The Mac Observer has performed a new set of tests, its most extensive so far, testing the effect on battery life when updating from OS X 10.8.1 to Build 12C35 of OS X 10.8.2, and also looking at upgrades from OS X Snow Leopard to OS X Lion.

The study shows that the testing build of 10.8.2 completely restores battery life to pre-Mountain Lion levels, giving approximately 380 minutes of power, compared to 260-275 under OS X 10.8.0 and 280-300 minutes running under OS X 10.8.1.

Not all users have experienced the battery life decrease under Mountain Lion, so it’s not clear what the exact cause of the issue is. But, for those suffering with the problem of decreased battery life, OS X 10.8.2 may be a welcome resolution to restore full battery life to their notebooks.

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  • Petar Živanić

    In my case it’s quite the contrary, I’ve seen even worse battery life with 10.8.2 updated, from 7+ hrs with Lion to almost 5 hours on ML up to the latest version to 4+ hrs with ML 10.8.2. I have a late-2011 13″ Macbook Pro (w/ 8 gigs of RAM and SSD drive) and I tried resetting SMC and whatnot, but to no avail… Any ideas?

    • Same experience – 6-7hrs under SL 10.6.8 and now 5 to 5.5 hrs with ML 10.6.8 – this is even after complete clean install and SMC 1.7 update for my 2year old Macbook Air (late 2010) with 93% battery health and 169 cycles…

      Many reporting this same thing in Apple forums.

      I believe the Mac Observer article points out a serious flaw in their testing methodology:“…We then disable all applications and services except for WiFi, set …”

      After all, how realistic is this? How many people disable all applications and services on their Mac portables. This in my books makes this test unreliable at best and misleading at worst.. For example, if the bluetooth radio was a culprit these test would miss this and I can guarantee you over 99% of mac portable users don’t disable their bluetooth radio or other “applications and services”..
      In future I hope other battery life comparison authors will have a realistic testing methodology which uses an “out of the box” default configuration, ie. applications and services are identical to a fresh install of each OS X installed.. This is more akin to how 99.9% of mac portable users will experience their performance.


Chris Hauk

MacTrast Senior Editor, and self-described “magnificent bastard,” Chris Hauk owns Phoenix Rising Services and writes for everyone’s favorite “bad movie” website, Big Bad Drive-In.

His first Apple product was an iPod Classic 9 years ago, and he has since added a MacBook Pro, a number of iPads, iPhones, and multiple Apple TVs to his collection.

He lives somewhere in the deep Southern part of America. Yes, he has to pump in both sunshine and the Internet.