Battery unit, set with a battery unit and a receptacle device for receiving the battery unit and bicycle frame with such set

A battery unit (1) for a drive mechanism for a bicycle comprising

• 1.1. at least one battery (21),
• 1.2. a housing (12) for receiving the at least one battery (21) with
• 1.2.1. at least one receptacle element (31) for receiving at least one supporting element (10) for mounting the battery unit (1) in or on a bicycle frame (3) and
• 1.3. at least one decoupling element interacting with the receptacle element (31) for at least partially mechanically decoupling the supporting element (10) incorporated in the receptacle element (31) from the housing (12),
• 1.4. wherein the at least one decoupling element comprises a slide-in shaft (34), which is stuck through the at least one receptacle element (31), and
• 1.5. wherein the at least one decoupling element comprises at least one of the group comprising an elastic and and a flexible component, by means of which the slide-in shaft (34) is held in the receptacle element (31).