NOVELTY - The unit has an interface element (12a), and a damping unit (14a) provided for performing vibration-damped mounting of a battery unit (10a). The damping unit provides damped connection of the battery unit with the interface element. A contact unit (16a) is arranged at the battery unit. A locking element (18a) is arranged at the interface element for rigidly connecting the interface element with a power handtool (20a). The interface element includes a contact holder (28a) including the damping unit for performing vibration-damped contact-making with a contact unit of the energy supply unit.    USE - Energy supply unit i.e. battery pack (claimed), for a power handtool i.e. workpiece processing machine. Uses include but are not limited to a power drill, a hammer drill, an impact power drill, a saw such as compass saw or reciprocating blade saw, a planer, a screwdriver, a miller, a grinder, an angle-grinder, an orbital sander, an item of garden equipment and a multi-function tool.    ADVANTAGE - The interface element includes the damping unit made of elastomeric material and arranged at the interface of the power handtool for reducing the transmission of oscillations and/or vibrations from the power handtool to the energy supply unit or parts of the energy supply unit, and providing secured contact-making property. The interface element includes a locking element with the damping unit for providing vibration-damped locking of the energy supply, thus achieving an effective oscillation damping with an energy supply unit. The unit ensures a secure connection between the interface element and the power handtool for protecting the battery unit mounted with vibration damping in the interior of an appropriate protective housing.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for a system for providing vibration-damped connection comprising a power tool.    DESCRIPTION OF DRAWING(S) - The drawing shows a side sectional view of an energy supply unit and a power handtool.    Battery unit (10a)    Interface element (12a)    Damping units (14a, 24a)    Contact unit (16a)    Locking element (18a)    Power handtool (20a)    Contact holder (28a)