My PRS-900 charges through the USB connected to the computer when the computer is off. Even though the computer is not running, the power is still connected, and a charge comes through the USB port. You can check this with a multimeter.
I think you can change the plug on your wall charger to fit. I would make sure to match the Output volts and amps correctly.
I have changed the wall part of my US wall charger to fit an Oz plug, but that is simpler, as the transformer to Output was not changed.
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