The aim of this research ist the systematic investigation of stationary electricity storage as a component of the energy transition with regard to its flexibility potential, in a multi-use operation, i. e. by combining multiple applications. In this contribution a Multi-Criteria-Decision-Making (MCDM) process using Fuzzy-TOPSIS has been evaluated. A Digital Twin (DT) of a battery storage system has been used to evaluate the decision making process of multi-use applications, front-of-the-meter (FTM) as well as behind-the-meter (BTM). This leads to a multi-objective optimization problem. From the pareto-optimal solution space a single solution will be selected using Fuzzy-TOPSIS considering the users preference among the optimization objectives.