Quote:
Originally Posted by mbagsh55
It should not be possible for one client-device to drain another client-device with both connected to the same host computer. A short would more likely cause the PC USB-port to short-out and likely damage that USB port.
An alternative explanation is that for some reason your PC is not charging the devices sufficently (hopefully not a damaged USB-port). There is some power drain on the reader or PDA just being connected and supporting communications with the PC, so if not charging properly the PDA would become drained after a while.
Sadly the only way to test this theory is to try and charge either/both devices on another PC. If you are using a USB hub you should also try charging without the hub connected, and make sure that the PC (assuming a laptop) is itself fully charged first.
Good luck
~marcus 
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Well, there's no hub involved, and the last time I tried charging the PDA, it was the only device plugged into USB. But I suppose I could try charging it on my wife's laptop tomorrow. (I do have spare PDA batteries, but they're at home, and I'm here through the end of the week.)