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   SMC Firmware Updates for MacBook Pro, MacBook Pro Retina, and MacBook
   Air

   Agen G. N. Schmitz

   Apple has released three System Management Controller (SMC) firmware
   updates for its MacBook lineup: [1]MacBook Pro SMC Firmware Update 1.8
   (703 KB; mid 2012 models), [2]MacBook Pro Retina SMC Firmware Update
   1.2 (712 KB; mid 2012 models), and [3]MacBook Air SMC Update 1.9 (1.09
   MB; mid 2012 and mid 2013 models). All three address battery-related
   issues, where your system could hang if the battery level goes below
   one percent or the battery could stop functioning altogether. The
   MacBook Air SMC Update also throws in the possible problem of the
   system not recognizing the battery. As always with firmware updates, we
   recommend relying on Software Update or the App Store app to ensure you
   get the firmware update for your specific model, and be careful not to
   interrupt the update process. (Free)

References

   1. http://support.apple.com/kb/DL1633
   2. http://support.apple.com/kb/DL1559
   3. http://support.apple.com/kb/DL1627

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