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I know that most USB ports will put out 5v .5amps, so you will only have 2.5w of heating power max. However iPad chargers and the likes will often put out 10w. I have a phone charger for my android that pumps out 5v 4amps! (20Watts), its possible theoretically to hook on up to the adapter and then mains power like that after a modification to a cable of coarse.
Last edited by Windston; 16-05-2016 at 10:26 PM.
Reason: missed a bit
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