Abstract: A battery charging system for electric vehicles comprising a wind tunnel positioned longitudinally along the frame structure of an electric vehicle such that the overall transverse cross section of the vehicle is not increased, designed to minimize the drag effect associated with the wind tunnel. The wind tunnel includes an internal bore having a wide elliptical cross section, defining an air passageway through which air flows, as the vehicle travels in a forward direction. A plurality of wind driven generators are situated within the wind tunnel adapted to covert the stream of air therein to electric energy. The battery charging system further comprises regenerative braking system and solar panels for converting braking force and solar energy to produce electric energy.