the idea is to use the Peltier while the phone is in the cradle inside the car, and cool it off while it is in the car. The peltiers i was looking at, need 12 V DC, which can be supplied from the car's system, and I would not be using the USB connectors for that. I was looking for a lower rated devices, around 30W, which still gives 2.5 A nominal, and I am very aware of the correct ratings for the wires and the connectors. This whole thing is in the concept stage, and all the inputs are appreciated...

The peltiers that i saw on ebay (do a search, you will find a zillion of them) do NOT come with their own power supplies or controllers...

I will post if i move forward on this - the Android device i am thinking about integrating into the car is great but it consumes way too much power and it overheats - I am able to cool it down, and thus reduce the power consumption (vicious circle, more Amps, hotter it gets, hotter if gets, more Amps it uses) but blasting the AC at MAX as we approach winter... that practice will give me a cool phone and RUNNING nose!!! lol...