Apple on Friday released a System Management Controller (SMC) firmware update for its MacBook Air devices. The latest version expands compatibility for newer service-replacement batteries. Users can download the updater, close any open applications and follow the installation steps before restarting the machine.

The SMC firmware Version 1.2 requires Mac OS X 10.5.7 and is available through the Mac OS X updater or Apple's support page. The package is contained in a 623KB file.