Abstract: A battery management system for classifying a battery module includes an interface and a processor. The battery module has a first and a second battery cell. The processor is configured to determine reference voltage curve on the basis of a mean voltage value of a first voltage curve associated with the first battery cell and a second voltage curve associated with a second battery cell and compare the first voltage curve to the reference voltage curve in order to obtain a first metric, and compare the second voltage curve to the reference voltage curve in order to obtain a second metric, and assign to the first voltage curve a first electrical characteristic and to the second voltage curve section of the reference voltage curve a second electrical characteristic in order to classify the battery module based on the first electrical characteristic and the second electrical characteristic.