No scenario kills a smartphone's charge faster than travel, when you're likely to rely on the device for navigation after using it on the plane for entertainment. The 8.1-ounce Anker Astro 3E external battery is barely larger than your phone but has enough juice to recharge it four times. [$30; ianker.com]
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Action-Packed Summer Trips
Race Dune Buggies, Explore Italy, Bike Yellowstone
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Nick Offerman's Life Advice
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