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While not sure about the cradle the Dell travel sync cable does pass the USB power directly through the cable. My guess is the cradle does as well but I have not tested that. The Axim does any current limiting etc on its own. Also when the Dell cradle is not connected to the power adapter but is connected to a USB port if the axim is OFF then it will charge. If the axim is on and using a dell cable then no USB power is used in any way.
About the whole reversal thing I have no idea whats going on there. People say the power drops quicker then it would without the cable connected but I would be interested to know just how much quicker. Also would be interesting to see just how much current is actually flowing out of the axim.
Oh and about what connection it is that is doing the reversal it has to be the 5.4v connection becuase thats the power pin that these cables run to. Although I am not trying to say the same thing will not happen on the USB power pin.
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