Abstract: A system for equalizing the charge level of batteries comprising battery cells (3) or battery blocks (9) connected in series. Controlled voltage converters (4) are on one side connected to a single or groups of battery cells (3) or battery blocks (9) and on another side connected to a common current path (5, 6), a positive conductor (5) thereof being connected to a positive pole (1) of the battery and the negative pole (6) thereof being connected to a negative pole (2) of the battery.