I bought a 200 watt inverter shaped like a soda can at Ace hardware, It takes cars 12 volts and changes it to 120v house current, it has two plugs and two usb ports (lower voltage) to charge phones & computers while driving. It's reg. price is 24.95 I bought mine on Black Friday for 9.95, it fits in any cup holder and plugs into cig. lighter. I can charge My Elocity A7 in a hour 99%, I also downloaded Battery Booster forom Getjar , It works great!