The system has a portable bag (1) i.e. backpack, comprising a battery (4) to supply power to an electric motor of a light vehicle. A power control circuit controls operation of the motor and delivers a signal relative to the operation. A display (2) displa...

The two-wheeler has a battery case (52) arranged in a battery housing space in rolling configuration. The space is defined in a vertical plane by a step plate assembly (61) and lower portions (12, 22) of frame elements (10, 20) corresponding to respective ...