Apple has released an update for its MacBook and MacBook Pro line of laptops addressing an issue with battery performance recently discovered by the company.
According to Apple the laptops in question were sold worldwide from February 2006 through April 2007. There is no safety issue with the batteries - the issue is limited to performance.
"We have issued a software update that is designed to improve battery performance, and consumers can receive a new battery free of charge if their battery continues to have performance issues after installing the software update, even if their computer is out of warranty," Apple announced.
More information on the battery update is available from Apple's web site