Process and device for determining state of an energy accumulator

The energy storage device has a data medium component (30) containing product base data and product reference data. The data medium component has a time counter (31) in addition to the data memory area (32) and is integrated into the energy storage device. The type number of the energy storage device, the date of manufacture and the serial number or other data belong to the product base data group. Independent claims are also included for the following: a method of conditioning an energy storage device for integration into a battery state detection routine.