Apple released an SMC firmware update today for Mid-2010 and Early-2011 15 and 17-inch MacBook Pros. The update is intended to fix a rare battery issue affecting certain MacBooks when the battery reaches over 1000 full charge cycles, and follows a previous update released for the same reason on different devices..
From the release notes:
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.
The update weighs in at just 1MB, and is available now for eligible machines through Software Update, as well as for direct download from Apple’s support site.