An object of this invention is to simultaneously resolve a decline in capacity due to undercharging of, and degradation due to overcharging of, a lead-acid battery, which occur as a result of random charging. One neck carries a thrust piston pump including a medium outlet. The profile light can be disengaged from the gantry and engaged with the docking station for moving the profile light to the docking position or disengaged from the docking station and reengaged with the gantry for moving the profile light to the inspection position. Other \u201cconductor\u201d casing pipes can be positioned around the surface casing inside the drive pipe. The dosing casing has a jacket enveloping the pumping unit and on which is integrally shaped at least one actuating member mounted in elastically pivotable manner between a rest position and an actuating position. The carrier can further include a bottom surface with a tread pattern having a pattern of grooves.