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I have purchased, and am successfully using OEM USB to micro cables. They work with the Palm wall charger, and when connecting to a computer I get the usual three options for connecting.
I have used a "generic" car 12V to USB charger. I don't know for sure what the amp output is at, but I think it's probably 500mA, and it charges fine. It does not work with the Touchstone, however, and I assume this is due to lower current output.
I would be careful with the chargers, as a failure in a component could pass high voltage to the Pre, and I don't know if or how the Pre is designed to respond to that.
I think if there is any charging circuitry in a USB powered device, it must be in the device itself.
Regards,
Tom
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