The invention relates to a truck mixer with at least one electric drum motor (60) for driving the mixing drum (90), the power supply connection of the drum motor (60) being connected to the internal electronics of the truck mixer via an electrical connection line, the supply connection being a connecting element, e.g. a plug element (55b), for the detachable connection (55) of the connecting line to the drum motor (60) and the connecting element (55b) enables the connection of an external device (100) for supplying energy to the drum motor (60) after the internal connecting line has been detached.
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