Whether you’re a glued-to-your-screen smartphone owner who can never make it through a day on a full charge—or someone who just needs an occasional battery boost—USB power banks are a panacea for low-battery anxiety. After putting in 21 hours of research and 55 hours of testing, we’ve found the best portable power banks to meet a wide range of needs, chargers that offer you peace of mind whenever wall outlets are out of reach.
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