Apple has issued SMC update 2.0 for all mid-2013 MacBook Airs, citing a fix for battery problems while the computer’s screen is closed.
This update addresses an issue which may cause the battery to drain faster than expected when the lid is closed.
You can download the update here or in the Mac App Store.
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What if you have 10.10 running?
It was also installed as part of the 10.9.4 update
On OS X 10.10 it says “This update is already installed on your computer.”.
Ironically the update seems to make my battery drain faster. Almost half gone in 2 hours of very light use.
thanks, i think i will update my MPA if this is available for me now