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Keep your phone and essential devices powered up and ready to go at all times by packing this sleek and portable External 2600 mAh Battery Charger along with you. Don’t let its small size fool you—this power tube has enough juice to give your phone an extra charge and could double the battery life of your phone (depending on the phone). It also works with any device that uses a mini or micro USB port, such as cameras, video cameras, mp3 players, and a smartphones.