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A good battery life for a laptop is between 5 and 9 real-world hours. There are some outstanding exceptions such as the ThinkPad X240 which boasts a whopping 15 hours of battery life. The MacBook Air received high praise in reviews for its exceptional battery life of 9-12 hours.
RocketTheme Articles /blog/reviews/155-how-to-find-the-best-laptop-for-web-development