An apparatus and its method of operation convert relative movements between a vehicle wheel and a body of the vehicle to electricity that is used to recharge a battery of the vehicle. The apparatus includes a generator provided on the vehicle and a linear motion to rotary motion converter that is connected between a wheel of the vehicle and an armature of the generator. Reciprocating movements of the wheel relative to the vehicle body are converted by the motion converter to rotations of the armature in the generator which produces electricity for recharging the battery of the vehicle.