Energy storage system for powering vehicle electric user devices

An energy storage system for powering electric user devices of a vehicle, the energy storage system having a battery; a capacitive element connected parallel to the terminals of the battery; and an inductive element connected in series to the battery, between the battery and the capacitive element; to effectively regulate power/energy flow between the battery and the capacitive element during transients, the ratio between the capacity of the battery measured in (Ah) and the capacitance of the capacitive element measured in (F) is less than 1, and the ratio between the capacity of the battery measured in (Ah) and the inductance of the inductive element measured in (μH) is less than 1.