Re: USB ports for power only?
giantrobot has it right, either a external USB hub, or a internal drive-slot model as you have shown an image of will work. (They are the same electronics, different form factors)
The catch is that those need +5volts to work, and your car is 12 to 13.5volts.
So you need a 5-volt car adapter to run the hub. You can buy a RadioShack 5volt adapter that can put out about 1amp which is about what you need if you are charging 4 devices. I have taken them apart before and hardwired them into the car, rather then plug them into power outlet.
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