Abstract: A battery system having a hose made from an elastic material. The hose is designed to be fitted on a hose connection by pushing a hose endpiece of the hose over the hose connection. The hose endpiece is designed to be fastened on the hose connection by a hose clip that is arranged in a fitting region of the hose endpiece. The hose endpiece has at least one thickened area which protrudes from the outer side of the hose. The thickened area protrudes from the outer side of the hose to such an extent that a hose clip suitable for fastening the hose on the hose connection is held on the hose endpiece by the thickened area with respect to the influence of gravity in the longitudinal direction of the hose endpiece. The hose may have multiple branch-off points.