Is there a portable Android phone charger with only a USB?

edited September 2016 in General Discussion

I am now into playing Niantic's smash hit game Pokemon GO, but my device is always running out of charge whilst playing it. I have seen others with portable chargers connected by cables to charge their phones but I preferably would want something smaller. Is there such thing as a portable charger that only connects through the Micro USB without a cable?

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