MacBook Air SMC Firmware Update 1.2
This SMC firmware update adds compatibility for the latest service replacement batteries.
For more information, please visit http://support.apple.com/kb/HT2368
For additional information, please visit: OS X Mountain Lion: Firmware updates may keep reappearing in the Mac App Store.
To complete the firmware update process, please follow the instructions in the updater application (/Application/Utilities/MacBook Air SMC Firmware Update.app). The updater will launch automatically when the installer closes.
Boot ROM or SMC Version Information:
After this update has successfully completed, your SMC Version will be: 1.23f20
After this update has successfully completed, your SMC Version will be: 1.34f8