whether USB battery packs bear a shortcoming,it’s that you bear to carry a USB wall charger to juice them back up at the end of the day. Not so with this model from RAVPower, which recharges by plugging directly into a wall, and while simultaneously acting as an AC charger for your phone. It even comes with a built-in microUSB cable,in addition to a standard USB port, making this a truly self-contained device. [RAVPOwer 9, and 000mAh Portable Charger With AC Connector,$24 with code 6QLBJT9O]
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Source: gawker.com