In an effort to provide a comprehensive look at battery life, we decided to take one of our test Macs back to Snow Leopard and test each build of OS X from 10.6.8 all the way to the current build of Mountain Lion on both an SSD and an HDD. Other readers wanted to know if there would be a significant difference in battery life if the tests were run on a solid state system drive (SSD) versus a traditional hard disk system drive (HDD).
ONYX FOR MAC SNOW LEOPARD 10.6.8 UPGRADE
In response to our reports, we received many questions and suggestions for further testing, with some readers telling us that they experienced a similar loss in battery life after the upgrade from 10.6 Snow Leopard to 10.7 Lion. We were able to demonstrate that the upgrade to OS X 10.8 Mountain Lion caused a significant reduction in battery life and that Mountain Lion’s first update, 10.8.1, only partially restored the lost running time. Last month we performed a series of battery life tests on three Mac laptops: a 2011 15-inch MacBook Pro, 2012 15-inch MacBook Pro with Retina Display, and a 2011 13-inch MacBook Air. We have put those builds through the same test and the results can be found here.
Update: The final builds of 10.8.2 and 10.7.5 were released by Apple on September 19.
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