Quote:
Originally Posted by Neanderthal
 How can a USB plug draw power on it's own if no device is plugged into it?
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Because it uses a transformer to drop voltage from 12v to 5v, your phone charger plugged into the wall at home pulls juice for the same reason, even when your phone isn't plugged in.
If you are worried about it, you should just get a cig outlet or other standardized 12v outlet, and an appropriate charger, unplug the charger when you aren't using it.