The current invention provides a battery system comprising several modular and similarly constructed submodules. Each submodule contains exactly one energy storage device and a switch system. The switches intelligently connect the energy storage devices in series or in parallel, or take them out of the circuit. Rather than compensating for the heterogeneity of the energy storage devices by "load balancing", the battery is maintained in its heterogeneous state and said state is only considered during loading / unloading by said "intelligent" interconnections ("intelligent balancing").
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