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Despite the new OS X Mavericks is supposed to increase the battery life of Mac machines, some users are experiencing a ‘horrible’ battery drain issue after upgrading to OS X Mavericks.

Apple’s technical forum supporters suggested to wait for the Spotlight to fully index, however, many people are still having the same issue even after waiting for days, and calibrating the battery.

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However, a battery test performed by Ars Technica claimed that Mavericks will improve the battery life, although, instead of battery life improvements, they are noticing a very noticeable decrease of battery efficiency.

The exact working solution is not yet found, but some Apple assistance suggested to reset the SMC.