Today, the mainstream media provided a first comprehensive retrospective on the MacBook Air notebook: you can read their insights in USA Today, the Wall Street Journal, and Newsweek. These articles are more about impressions and descriptions of the device than actual product reviews. Nonetheless, at least two out of these three publications hit on a critical point worth paying attention to: the actual battery life of the MacBook Air. Edward Baig from USA Today reports that when using the laptop for web browsing and writing, the battery lasts 3 hours and 40 minutes; however, when watching movies, it only lasts 2 hours and 40 minutes. Walt Mossberg, on the other hand, has his own testing standards. By playing music in a loop without being plugged in and with the screen brightness set to maximum, he found the battery lasted 3 hours and 24 minutes. I believe...%B