Method for operating a battery system, battery system and motor vehicle

The method involves activating first battery module for predetermined cycle time, then activating second battery module for predetermined cycle time and simultaneously deactivating the first battery module. The second battery module is activated after the first battery module is activated, and the second battery module is activated at the same time that the first battery module is deactivated. Independent claims are included for the following: (1) a battery system; and (2) motor vehicle.