NOVELTY - Energy store comprises: a rechargeable primary energy store (1) comprising an anion generating and anion conducting first electrode (3), an anion receiving and/or anion conducting second electrode (5), an anion conducting electrolyte (7) arranged between the first electrode and the second electrode, and a stationary first redox-pair; at least a storable second oxidation reactant that belongs to a second redox pair; a secondary energy store (13) that is formed as a store for the second oxidation reactant; and a connecting line between primary energy store and secondary energy store.    USE - The energy store is useful for storing and supplying electrical energy e.g. for mobile phones and portable computers.    ADVANTAGE - The energy store is safe, replaceable, environment friendly and cost-efficient.    DETAILED DESCRIPTION - Energy store comprises: a rechargeable primary energy store (1) comprising an anion generating and anion conducting first electrode (3), an anion receiving and/or anion conducting second electrode (5), an anion conducting electrolyte (7) arranged between the first electrode and the second electrode, and a stationary first redox-pair forming the second electrode or in contact with the second electrode, which comprises a oxidation reactant and an oxidation product; at least a storable second oxidation reactant that belongs to a second redox pair; a secondary energy store (13) that is formed as a store for the second oxidation reactant; and a connecting line between the primary energy store and the secondary energy store, which allows the second oxidation reactant to be directed from the primary energy store to the secondary energy store and back. INDEPENDENT CLAIMS are also included for:    (1) an electrical system comprising an electrical load and at least one energy store; and    (2) discharging and charging the energy store comprising (a) discharging the primary energy store by discharging electrical energy during discharging, oxidizing the first oxidation reactant to the first oxidation product, and supplying the second oxidation reactant from the secondary energy store to the primary energy store for further discharging of electrical energy and oxidizing the second redox pair to the oxidation product at the second electrode, and (b) charging the primary energy store by receiving electrical energy during charging, reducing the first oxidation product of the first redox pair to the first oxidation reactant, and supplying the oxidation product of the second redox pair to the primary energy store by further receiving the electrical energy that is reduced to the second oxidation reactant at the second electrode and conducting the resulting oxidation reactant at the second electrode for storing in the secondary energy store.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic representation of the energy store.    Primary energy store (1)    First electrode (3)    Second electrode (5)    Electrolyte (7)    Secondary energy store (13)