Give or take, that is nearly 50 hours of battery life without needing a single wall socket. The highest capacity backup battery packs listed below lets you charge a MacBook Air up to 4 times. You won’t be left without power for MacBook or other USB devices. If you do a lot of field work, work away from the office, take daily commutes that can last for an hour or more, a frequent flyer or look to take that long vacation with several hops this summer, then an external battery charger is going to be a life saver. Most of you have seen this and some of you might have been there too, sitting on the floor in the mall or at the airport, next to a wall socket, charging your laptop for the connecting flight or some extra work hours.
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