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I've dabbled in electronics and as a previous poster suggested, USB devices will work down to 100 mA, but what I wonder is whether it is worth the time it would take to charge a device at that rate? I would just plug it into the computer and charge it off of that, at least that will get you up to 500 mA if all is well. That should charge at least twice as fast as 180 mA will.
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