Batteries on typical smartphones last between eight and 10 hours, with 38 percent of smartphone users depleting the battery at least once a week. Late or — even worse — in the middle of a work day, is no time for a smartphone or tablet to run out of juice. Enter the growing category of portable battery chargers. For example, Jackery Giant +, www.jackery.com, is a streamlined large capacity portable dual USB mobile device charger compatible with a spectrum of iPhone and Galaxy ...

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