Can a battery powered motor act as a generator when faced with oposite resistance?
Yep. If you turn the axial on the motor it will create an electric current. You can see this if you attach it to a multimeter, although will probably have to spin it extremely fast and have the multimeter on a low setting for it the current to be picked up by the multimeter. I don’t think you would get enough current to recharge the batteries very much though. You could try and see what happens. Make sure you get the polarity right or you will uncharge them. Also i think you need a higher voltage to recharge the batteries, I am not sure though.
