Apple has posted an update for the battery of its MacBook Pro line-up.
Battery Update 1.3 updates battery firmware and addresses battery performance issues with the 15-inch MacBook Pro. Your computer's power cord must be connected and plugged into a working power source while running this update.
After the Battery Update has been installed, any additional batteries you put in your 15-inch MacBook Pro are automatically updated.
For further information on this Update, please visit this website: http://www.info.apple.com/kbnum/n305540 [1].
The update, which weights 480KB, works with all the MacBook Pros and is available either through the Software Update utility or through Apple's support web site.