Summer concertgoers are familiar with this dilemma: As you're sprinting across a field to catch the next act, you look down at your phone and see you're running low on juice. Do you keep charging ahead and risk being unreachable post-Kanye, or do you stop at one of the rare phone-charging stations and risk missing part of the show? It's a 21st century conundrum. But thanks to a new wearable smartphone charger currently being trialed at Glastonbury Festival, it might soon be a choice you don't have to make.
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