Apple today released Battery Update 1.2 which updates battery firmware and improves battery functionality.
After Battery Update has been installed, each battery you insert into your MacBook or MacBook Pro will be updated automatically. Your computer’s power cord must be connected and plugged into a working power source.
Battery Update 1.2 is available via Software Update and also as a standalone installer.
More info and download link (244KB) here.
[Thanks to MacDailyNews Reader “Rainy Day” for the heads up.]