Monday last Apple released a new firmware update for compatible MacBook Air models. If you have a MacBook Air, you can use Software Update to download and install the new firmware. Alternatively, you can go to Apples site and download the update there.
SMC Firmware Updates are for the System Management Controller (SMC) found on all Intel Macs. The SMC controls power and thermal management, which includes battery and fans.
This upgrade addresses difference in new, replacement batteries Apple is issuing now. They are different from the originals enough that the new firmware version is required.
From Apple’s documentation:
This SMC firmware update adds compatibility for the latest service replacement batteries…. After this update has successfully completed, your SMC Version will be: 1.23f20 [for original MacBook Air models, or] 1.34f8 [for more recent models].
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