A mobile strapping device for strapping packaged goods with wrap-around strap including a tensioner for applying a strap tension to a loop of a wrapping strap, and a friction welder for producing a friction weld connection by way of a friction welding element at two areas of the loop of the wrapping strap disposed one on top of the other, and a chargeable energy storage means for storing electrical energy that can be released as drive energy for motorized drive motions at least for the friction welder for producing a friction weld connection. For a strapping device with high functional reliability and ease of handling, despite the possibility of automated production of wrapped straps, at least to a large extent, the strapping device to includes a planetary gear system for transferring and changing the rotational speed of a drive motion provided by an electrical drive of the friction welder.