Battery Pack Coupling System

A battery pack coupling system for mechanically and/or electrically coupling a battery pack optionally to a harness device or to a manually operated electrical device includes a mechanical backpack coupling interface at the battery pack for the releasable mechanical coupling to a corresponding mechanical battery pack-backpack coupling interface at the harness device and/or an electrical coupling interface at the battery pack and an electrical connecting line with a connecting plug body at the end which can be releasably coupled to the electrical coupling interface. The battery pack coupling system has a mechanical device coupling interface at the battery pack, different from the mechanical backpack coupling interface, for the releasable mechanical coupling to a corresponding mechanical battery pack-device coupling interface at the electrical device and/or a plug fastening mechanism through which the connecting plug body can be fastened releasably to the harness device.