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As you can see from the chart, the battery life hit caused by 10.8 Mountain Lion is significant. Our 2011 MacBook Pro lost 2 hours and 10 minutes, or 33 percent, of battery operating time following the upgrade. Removing the WiFi icon from the menu bar had no positive impact (in fact, we actually lost 5 minutes of battery life).
The prerelease build of 10.8.1 improved things a little bit, and gave us back about 30 minutes of battery life, but we were still about 100 minutes short of where we should be based on Lion’s battery numbers.
With great anticipation, we installed the final build of 10.8.1 this morning and ran our benchmark again, only to be disappointed by the results. Battery such as Hp Pavilion dv9000 battery (Hp dv9000 battery ), Hp EV087AA battery , Hp EX942AA battery , Hp Pavilion ZT3000 battery , Hp 337607-001 battery , Hp 398876-001 battery , Hp PB992A battery , Hp PB994A battery , Hp PB991A battery life did improve by about 17 minutes over the prerelease build, but we are still over an hour short on battery life compared to 10.7.4’s numbers, a difference of about 20 percent.
These numbers may not be final; Apple is already testing 10.8.2 with select developers, although we have no word from the company on its plans to further address battery life concerns. It’s also possible that Mountain Lion simply requires more power from the system to perform new graphical and under-the-hood tasks, and that an unfortunate result of these new features is a reduction in usable battery life.
In the end, it’s clear that 10.8.1 has brought with it a sizable increase in battery life compared to 10.8, but the initial loss caused by the upgrade to Mountain Lion was so large that MacBook battery life is still far shy of where it should be.
From here, all that portable Mac users can do is follow Apple’s Mountain Lion development and hope that they have a plan to restore battery life to 10.7 Lion-like levels in future updates. We have contacted Apple with a request for comment on the numbers we obtained but they have not responded to our inquires. We will update this article if they do.
Tune in Friday and Saturday for the results of our tests on the Retina MacBook Pro and the 2011 13-inch MacBook Air.