Measuring arrangement for identifying a malfunction of an energy accumulator assembly comprising a first energy accumulator and at least one further energy accumulator (105, 107), wherein the first energy accumulator and the further energy accumulator (105, 107) are electrically connected in parallel, the measuring arrangement comprising: a measuring device which is configured to capture a polarity of an electric current and/or voltage of the first energy accumulator and a polarity of a further electric current and/or voltage in the energy accumulator assembly; a processor device which is configured to identify the malfunction of the energy accumulator assembly by comparing the polarity of the electric current and/or voltage of the first energy accumulator and the polarity of the further electric current and/or voltage, characterized by, that the measuring arrangement comprises a circuit arrangement comprising a first controllable switch for electrically connecting the first energy accumulator with the measuring device and a further controllable switch (305, 307) for electrically connecting the further energy accumulator (105, 107) with the measuring device in order to connect the first energy accumulator and the further energy accumulator (105, 107) in parallel, wherein the processor device is configured to close the first switch and the further switch (305, 307) or to keep them closed for capturing the polarity of the electric current and/or voltage of the first energy accumulator and for capturing the polarity of the further electric current and/or voltage, and wherein the processor device is configured to evaluate the measured electric currents and/or voltages, in particular to compare them with electric reference variables, in order to identify a malfunction of the first energy accumulator or the further energy accumulator (105,107). a measuring device which is configured to capture a polarity of an electric current and/or voltage of the first energy accumulator and a polarity of a further electric current and/or voltage in the energy accumulator assembly; a processor device which is configured to identify the malfunction of the energy accumulator assembly by comparing the polarity of the electric current and/or voltage of the first energy accumulator and the polarity of the further electric current and/or voltage, characterized by, that the measuring arrangement comprises a circuit arrangement comprising a first controllable switch for electrically connecting the first energy accumulator with the measuring device and a further controllable switch (305, 307) for electrically connecting the further energy accumulator (105, 107) with the measuring device in order to connect the first energy accumulator and the further energy accumulator (105, 107) in parallel, wherein the processor device is configured to close the first switch and the further switch (305, 307) or to keep them closed for capturing the polarity of the electric current and/or voltage of the first energy accumulator and for capturing the polarity of the further electric current and/or voltage, and wherein the processor device is configured to evaluate the measured electric currents and/or voltages, in particular to compare them with electric reference variables, in order to identify a malfunction of the first energy accumulator or the further energy accumulator (105,107).