The update is a 1 MB download and requires OS X 10.6.8, 10.7.5, or 10.8.2.About MacBook Pro SMC Firmware Update 1.7
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.
Article Link: Apple Releases Firmware Battery Fix for 2010/2011 MacBook Pro 15- and 17-Inch Models