Lipstick-sized USB battery packs are awesome if your phone needs a little extra juice to get through the day, but most of them weigh in at around 3,000mAh, which might not be enough. This model from Poweradd is slightly larger physically, but crams in 5,000mAh, which should be enough for a full phone charge, with a little power to spare. [Poweradd Slim2 5000mAh Portable Charger, $8 with code E6IOGQPJ]

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