Apple has released Thunderbolt Firmware Update v1.1, which addresses a problem with the mid-2012 MacBook Pro (when using certain Thunderbolt cables) that prevented some bus-powered Thunderbolt devices from working as expected. The update requires Mac OS X Lion 10.7.4 or later. (Free, 442 KB)
View Extra Battery Details in Snow Leopard
In Snow Leopard, Option-click the Battery icon in the menu bar to show the battery's current condition - Normal is good. Other messages might read Replace Soon, Replace Now, Check Battery, or Service Battery. Choosing the message opens a Mac Help document with more information.