A mobile strapping device for strapping packaged goods with wrap-around strap, comprising a tensioner for applying a strap tension to a loop of a wrapping strap, and a connector for producing a connection in two areas of the loop of the wrapping strap disposed one on top of the other, and a chargeable energy storage means for storing energy that can be released as drive energy for motorized drive motions at least for the friction welder for producing a friction welded connection and/or for the tensioner, is intended to have high functional reliability and ease of handling despite the possibility of automated production of wrapped straps, at least to a large extent. To this end, it is proposed that the energy storage means of the strapping device comprise a lithium ion battery for providing energy for driving a connector designed as a friction welder.