Retractable electric charging device

An electric charging device for a window lift system for vehicle doors, wherein the window lift system comprises an active system comprising an active glass window and window wiring, the window wiring comprising a connector, and a rail on which said active glass window moves, wherein the active glass window is configured to darken by receiving a current flow through the window wiring, wherein the electric charging device comprises:

• a cable dispenser comprising a retractable means,
• an electric cable configured to be housed in the cable dispenser, wherein the cable dispenser allows extension and retraction of the electric cable by means of the retractable means during the movement of the active glass window along the rail,
• wherein the electric cable comprises:
• a first end connectable to a current source providing current flow;
• and
• a second end connected to a counter-connector;
• wherein the counter-connector is configured to be connectable to the connector of the active system establishing an electrical circuit between the current source and the active glass window allowing passage of the current flow, and
• wherein the current flow of the electrical circuit acts on the active glass window causing darkening of the active glass window.