A method for ascertaining operating parameters of an electrochemical storage battery, taking into account electrolyte stratification. A wheel having a hub and a hub axle opening through the hub is attached to the yoke leg with an axle bolt. The spring element is made of silicone and, on its side facing the work space, is provided with a protective layer consisting of a material that is resistant to the damping liquid and is impervious thereto. It may be dried or extracted if necessary. In addition, the multimedia program executes corresponding operations when detecting other signals from the operating system. The lighting device includes:a heat radiating body which comprises a base and a cylindrical body extending to the base;a light source disposed on a part of the heat radiating body; andan outer case being spaced apart from an outer surface of the heat radiating body and surrounding the heat radiating body.