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

   Agen G. N. Schmitz

   Apple has released three System Management Controller (SMC) firmware
   updates for its MacBook lineup: [1]MacBook SMC Firmware Update 1.5 (494
   KB), [2]MacBook Pro SMC Firmware Update 1.6 (666 KB), and [3]MacBook
   Air SMC Update 1.8 (982 KB). All three address a 'rare issue' that
   caused laptops with a battery that had accumulated more than 1,000
   charge cycles to shut down and possibly not boot back up again.
   According to this [4]Apple support page, all MacBook Pro and MacBook
   Air models (as well as MacBook models from 2009 and later) have a
   lifetime expectancy of 1,000 charge cycles. As always with firmware
   updates, we recommend relying on Software Update 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/DL1625
   2. http://support.apple.com/kb/DL1626
   3. http://support.apple.com/kb/DL1627
   4. http://support.apple.com/kb/HT1519

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