Thanks to compact all-flash storage in MacBook Air, there’s plenty of room for a big battery. Working together with the new power-efficient Intel Core architecture, this battery can post some impressive numbers. Now the 13-inch model gets up to 12 hours of battery life on a single charge and the 11-inch model gets up to 9 hours. That gives you all-day power for word processing, presentations, email, and more. And if you’re watching iTunes movies, you get up to 10 hours of playback time on the 13-inch model and up to 8 hours on the 11-inch. Put MacBook Air to sleep for more than 3 hours, and it enters standby mode to conserve battery life for up to 30 days. And if you enable Power Nap, you’ll continue to receive new email and calendar invitations while your computer is asleep.