According to AnandTech's tests [1] (the ones you linked to), the 13" gets over 11 hours in OS X - the 11" is just under 7. [1]: http://www.anandtech.com/show/3

According to AnandTech's tests [1] (the ones you linked to), the 13" gets over 11 hours in OS X - the 11" is just under 7. [1]: http://www.anandtech.com/show/3991/apples-2010-macbook-air-11-13inch-reviewed/9 http://www.anandtech.com/show/3991/apples-2010-macbook-air-1...