The invention relates to an ear cup with an attachment unit, which is configured to be used within a head-worn hearing device. The attachment unit comprises at least one connection section, which is arranged and configured to rotatable connect the attachment unit with the ear cup and thereby define an axis of rotation of the ear cup. The attachment unit further comprises an opening, which is arranged to allow a charge interface of the ear cup, which extends out of an ear cup casing of the ear cup, to pivot through the attachment unit while the ear cup is being rotated with respect to the attachment unit along the axis of rotation, wherein the charge interface is directed to the attachment unit and is placed at a side portion of the ear cup between a hearing portion of the ear cup, facing to an ear of a user, and a back portion of the ear cup, facing away from the user.