To this end the following vehicle and terminology definitions are presented for UN GTR consideration : ( a ) Electric Vehicle I ( EV-I ) : A road transport vehicle whose drive-train consists of one or more electric motors that receive their energy from one or more externally charged batteries ; ( b ) Electric Vehicle II ( EV-II ) : A road transport vehicle whose drive-train consists of one or more electric motors that receive their energy from one or more batteries that are charged by an on-board internal combustion engine that is not connected to the vehicle drive-train ;