Electrical systems for balancing charging or loading of parallel-arrayed charge accumulators (1, 2), particularly batteries, storage batteries, etc. The systems include circuitry used to supply voltage to a load (7) or to electrically charge the accumulators (1, 2), or both, via connections (3a, 3b, 4a, 4b) at the charge accumulator side and interface connections at the load or charger side. An electrical circuit (10) has at least one DC converter (11) that converts the differential voltage between the matching polarity connections (3a, 4a) at the charge accumulator side, or converts a voltage derived from this differential voltage. Voltage supply devices for loads, or charging devices for charge accumulators, may include circuits of this type.