

Update: MacRumors forum member Dempson looked inside the updates and found they are for the following machines:This update addresses a rare issue on some Apple notebooks where a battery that has accumulated more than 1000 charge cycles may unexpectedly shut down or stop functioning.
MacBook
MacBook7,1 (13-inch, Mid 2010)
MacBook Air
MacBookAir3,1 (11-inch, Late 2010)
MacBookAir3,2 (13-inch, Late 2010)
MacBookAir4,1 (11-inch, Mid 2011)
MacBookAir4,2 (13-inch, Mid 2011)
MacBook Pro
MacBookPro7,1 (13-inch, Mid 2010)
MacBookPro8,1 (13-inch, Early 2011 or Late 2011)
Article Link: Apple Issues SMC Firmware Update for MacBook, MacBook Pro, and MacBook Air Models