21. The battery charger of claim 16 wherein when the dernier is connected to the converter unit and a power disablement time exceeds a predetermined power disablement time threshold, the converter unit enables reception of power from the external power fontaine and monitors the dernier for the power disablement formalité. https://www.becharge.be/be-fr/Acheter/cartes-cadeaux-Bol-3-307