Electrically operated mobile vacuum cleaner for separating dust and particles from a suction flow , the vacuum cleaner comprising an electric motor and a turbine for generating the suction flow , a vacuum cleaner housing (4, 6; 32) in which the electric motor and a collection chamber for collecting the dust and particles separated from the suction flow are arranged, at least one battery cell for providing the electric motor with electric energy for its operation, a plurality of wheels assigned to the vacuum cleaner , on which the vacuum cleaner can be moved over a ground surface, wherein the at least one battery cell forms an integral part of an extractable battery pack , the vacuum cleaner housing (4, 6; 32) comprises a recess with a longitudinal extension , the recess opening towards the environment and adapted for receiving at least part of the battery pack in a direction parallel to the longitudinal extension , the battery pack is equipped with at least two separate first electrical contact elements (60; 60') electrically connected to the at least one battery cell , and the recess is equipped with at least two separate second electrical contact elements (64; 64') electrically connected to the electric motor , the first and second contact elements (60, 64; 60, 64') are adapted to automatically enter into a mutual electric contact upon insertion of at least part of the battery pack into the recess for establishing an electric connection between the at least one battery cell and the electric motor and operation of the vacuum cleaner by means of electric energy from the at least one battery cell , and the vacuum cleaner housing (4, 6; 32) comprises an upper part comprising at least the electric motor and the turbine and a lower part comprising the dust collection chamber , characterized in that the recess is provided in a housing of the upper part of the vacuum cleaner housing, and the upper part is releasably attached to the bottom part . an electric motor and a turbine for generating the suction flow , a vacuum cleaner housing (4, 6; 32) in which the electric motor and a collection chamber for collecting the dust and particles separated from the suction flow are arranged, at least one battery cell for providing the electric motor with electric energy for its operation, a plurality of wheels assigned to the vacuum cleaner , on which the vacuum cleaner can be moved over a ground surface, wherein the at least one battery cell forms an integral part of an extractable battery pack , the vacuum cleaner housing (4, 6; 32) comprises a recess with a longitudinal extension , the recess opening towards the environment and adapted for receiving at least part of the battery pack in a direction parallel to the longitudinal extension , the battery pack is equipped with at least two separate first electrical contact elements (60; 60') electrically connected to the at least one battery cell , and the recess is equipped with at least two separate second electrical contact elements (64; 64') electrically connected to the electric motor , the first and second contact elements (60, 64; 60, 64') are adapted to automatically enter into a mutual electric contact upon insertion of at least part of the battery pack into the recess for establishing an electric connection between the at least one battery cell and the electric motor and operation of the vacuum cleaner by means of electric energy from the at least one battery cell , and the vacuum cleaner housing (4, 6; 32) comprises an upper part comprising at least the electric motor and the turbine and a lower part comprising the dust collection chamber , characterized in that the recess is provided in a housing of the upper part of the vacuum cleaner housing, and the upper part is releasably attached to the bottom part . <EOS>