Battery life is the same as the original Air. I dont like the Orginal Air . is ugly, if u upgrade 4 to the Original Air, the weight will be a big difference, but the perfomance is the same as the 4. I can say that because I have a friend that have the Original Air, and there r the same. If u upgrade , upgrade to the Air 2,.Otherwise, the upgrade its not worth it. Antii reflective coating makes difference!!!!!!