Battery pack for supplying an electrically driven treatment apparatus with an electric driving power (AL), the battery pack comprising: - a plurality of accumulator cells , wherein the accumulator cells have cell contacts , - at least one circuit board , wherein the at least one circuit board is electrically connected to the cell contacts , and - a battery pack housing , wherein the battery pack housing has a first battery pack housing part and a second battery pack housing part , wherein the first battery pack housing part and the second battery pack housing part are closed by each other, - wherein the accumulator cells are disposed within the battery pack housing , characterized - in that the cell contacts and the at least one circuit board are disposed within the second battery pack housing part , wherein the second battery pack housing part is configured as a mold for a casting compound , and wherein the cell contacts and the at least one circuit board are enclosed by the casting compound , and/or - in that the at least one circuit board is disposed within the battery pack housing , wherein the one battery pack housing part has at least one thread , wherein the other battery pack housing part has at least one head abutment surface , wherein the head abutment surface is disposed on an end adjacent to the one battery pack housing part of the other battery pack housing part , wherein the battery pack has at least one screw , wherein the screw is screwed into the thread for mechanical connection of the one battery pack housing part and the other battery pack housing part to each other, and a screw head bears on the head abutment surface . - a plurality of accumulator cells , wherein the accumulator cells have cell contacts , - at least one circuit board , wherein the at least one circuit board is electrically connected to the cell contacts , and - a battery pack housing , wherein the battery pack housing has a first battery pack housing part and a second battery pack housing part , wherein the first battery pack housing part and the second battery pack housing part are closed by each other, - wherein the accumulator cells are disposed within the battery pack housing , characterized - in that the cell contacts and the at least one circuit board are disposed within the second battery pack housing part , wherein the second battery pack housing part is configured as a mold for a casting compound , and wherein the cell contacts and the at least one circuit board are enclosed by the casting compound , and/or - in that the at least one circuit board is disposed within the battery pack housing , wherein the one battery pack housing part has at least one thread , wherein the other battery pack housing part has at least one head abutment surface , wherein the head abutment surface is disposed on an end adjacent to the one battery pack housing part of the other battery pack housing part , wherein the battery pack has at least one screw , wherein the screw is screwed into the thread for mechanical connection of the one battery pack housing part and the other battery pack housing part to each other, and a screw head bears on the head abutment surface . <EOS>