Apple has released Battery Update 1.2 for MacBook and MacBook Pro laptops. The company says this fix updates battery firmware and improves battery functionality. It requires Mac OS X 10.4.8 or later and applies to the following systems: MacBook, MacBook (Late 2006), MacBook Pro (15-inch), MacBook Pro (15-inch Glossy), MacBook Pro (15-inch Core 2 Duo), MacBook Pro (17-inch), and MacBook Pro (17-inch Core 2 Duo). After Battery Update has been installed, each battery you insert into your MacBook or MacBook Pro will be updated automatically.