been reached the type of the light signal issued by the lighting element 12 changes from the first light signal shown in fig2 to a second light signal shown in fig3 the control device 7 detects the full state of charge of the energy storage device 2 concurrently with detection the control device 7 activates the respective lighting element 12 i e for example the rgb led so that a constant light signal is issued i e the lighting element 12 is lit continuously and furthermore a switchover to a second light color here green is implemented this solid green light signals to the user that the charging process is now complete finally fig4 shows the situation when after successfully completing charging the charging cable 4 is disconnected as shown by the arrow the control device 7 immediately detects the removal of the charging cable 4 this detection causes it to change back again to the normal u201c blinker light operating mode u201d in which the blinker lights 8 9 and 11 emit respective direction signals when the blinker lever is actuated to signal this to the user i e that the u201c charge indicator mode u201d has been exited the lighting element 12 is respectively activated by the control unit 7 for a third time for example the control device after causing previously the issuance of a constant green light signal now issues again a flashing signal with orange light color this means that the lighting element 12 lights up briefly for example three times or five times and intensely orange to signal to the user that the control device 7 again assumes the normal flashing mode in the event the charging cable.