USB battery cable / bracket thingy
John - Is the circuitry voltage protected? I'm assuming yes, since I believe the standard usb voltage is larger then 3 volts.
If so, how about a cable or clip on device that would connect a standard 9volt battery direct to the mini USB slot?. Cable would work, but a holder that a 9volt battery is inserted into, with a mini male plug would work also.
Regards - Don