I just use the usb cable that came with their phone and plug it into my auto usb or the car's 110 outlet.
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LG G2 vzw - Stock Rooted
Semi retired: vzw GNex - Shiny 4.3
Nexus 7 - stock rooted 4.3
Kindle Fire gen 1 - stock
MOTO Droid BB 2.3 - Retired