The battery life you get will depend on what you are doing with your mac. You will not get 7 hours if you are watching a movie, playing a graphics intensive video game, or doing photo/video editing. In those cases, maybe you could expect to get 3-4 hours. Doing general web surfing, word processing, watching some youtube videos etc you could probably expect 5-6 hours. The 7 hour battery claim is if you are doing virtually next to nothing on your mac and have the energy saver settings at the most optimal levels. Read this: http://www.apple.com/batteries/notebooks.html