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I've read about a guy trying this in a powered bicycle forum who got poor results. The problem is the cheap nimh batteries can't dump amps fast enough to power the motor. This called the C rating, which isn't published on the specs; at least not the ebay ones. C refers to the rated discharge capacity of the battery. A 1000mAh battery rated at 1C can only discharge about 1000mA continuously. Hobby batteries for airplanes etc are rated at 10, 20, 30 and 40C. (maybe more, I don't know)
Once you start looking at batteries that publish a realistic C rating, the price goes way up
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