Its battery at the start of the tests had 159 cycles and was considered healthy by OS X. Our test MacBook Pro, which readers should note is a different computer than the one used in our first tests, has been lightly used during its life. Our test computer is a 2011 15-inch MacBook Pro at 2.0 GHz with 8 GB of RAM, a Radeon HD 6490M GPU, and two internal drives: an OCZ Vertex 4 64 GB SSD and a Seagate Momentus 750 GB HDD (we used an Other World Computing Data Doubler bracket to replace the MacBook Pro’s optical drive with the Seagate hard drive). We hope that our tests will answer some questions about a Mac’s battery life “journey” though the many iterations of OS X over the past few years. 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).
Upgrade from leopard to mountain lion mac 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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