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I hope some people will post their experience on this topic. Several vendors have come up with USB synch/charge cables, sometimes combined with adaptors for cars, etc. And of course the vendors all swear their units work. But to my knowledge, Dell has not come out with such a product. I'm still wondering why Dell has a 5.4 V charger -- USB is 5.0 V (at best).
To answer Axim5, one possibility is that the 500 mA is not enough current. Since you state the current limitation, it sounds like you already suspect this could be a problem. USB ports often shut down if the device tries to pull too much current, to protect themselves from short circuits. The really good ones notify the user through a screen message.
Are you using a hub? If so, is it a self-powered hub? If your hub does not use a power supply, it really can't deliver much current to the USB device.
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The world may not be perfect yet, but the Axim is (almost).
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