Self Propelled Electric Generator:is It Possible

  hi this one goes out to the tech gurus out there, i need a weight out of 10 on the feasibility  of an idea i came up with, and that is a kind of self- propelled mechanical assemble that incorporates a 12v drycell battery to power a dc motor which in turn is used to operate a dynamo{an assemble that converts rotary energy to ac electrical energy),then part of the output from the dynamo is tapped,rectified and fed to the input of the dc motor and the battery now ejected from the circuit.