Thanks to compact all-flash storage in MacBook air.there’s plenty of room for a big battery working together with the power efficient fourth-generation intel core architecture this bittrey can post some impressive number the 11-inch model gets up to 9 hours of battry on a single charge that give you all-day power of surfing the web or watching iTunes films put MacBook air to sleep for more than 3 hour and it enters standby mode to conserve battery life for up to 30 days.