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(Apple calculates these results using a new battery test, in which it visits the top 25 Web sites over and over, doing whatever you do on each onesearch, browse, play videos and so onuntil the battery’s dead. The 13-inch MacBook Air is one of the longest-lasting notebooks on the market. Both MacBook Air models still boast the incredibly thin 0.3-1.7cm unibody design. Battery type:Li-Polymer Capacity:35Wh Voltage: 7.6V Cells: 4-Cell.