NOVELTY - A rechargeable battery comprises a first electrode and a second electrode separated by an ion-conducting barrier, where in its charged state, the rechargeable battery includes a molten salt comprising quinone or quinone derivative A at the first electrode and a molten salt comprising hydroquinone or hydroquinone derivative B at the second electrode.    USE - The rechargeable battery and are useful for storing energy (claimed); and for industrial and commercial applications.    ADVANTAGE - The rechargeable battery is highly improved, cost effective and efficiently stores energy.    DETAILED DESCRIPTION - A rechargeable battery comprises a first electrode and a second electrode separated by an ion-conducting barrier, where in its charged state, the rechargeable battery includes a molten salt comprising quinone or quinone derivative A having the structure of Formula (I) at the first electrode and a molten salt comprising hydroquinone or hydroquinone derivative B having the structure of Formula (II) or the structure of Formula (III) at the second electrode, where during the discharging process, charge flows from the second electrode to the first electrode through the reduction of quinone or quinone derivative A according to reaction scheme 1a, and the oxidation of hydroquinone or hydroquinone derivative B according to reaction scheme 2a or reaction scheme 3a.    R1-R7=independently be A; hydrogen; 1-10C linear, branched chain or cyclic alkyl groups; aryl; hetero cycles; Cl, Br, I, CN; OH or NO2, where the alkyl and aryl substituents may themselves be substituted or unsubstituted; if the quinone or quinone derivative is anionic or the hydroquinone or hydroquinone derivative is anionic A represents SO3- or COO-, O-HPO3- or O-PO32- or R-O-SO3-; and if the quinone or quinone derivative is cationic or the hydroquinone or hydroquinone derivative is cationic either: A and optionally one or more of R1-R7 independently represent imidazolium, piperidinium, pyridinium, phosphonium, pyrazinium, quaternary amine, ammonium species or derivatives; or one or more of the ring atoms is a quaternized heteroatom and A represents hydrogen; a 1-10C linear, branched chain or cyclic alkyl group; an aryl group; a heterocycle group; Cl, Br, I, CN; OH or NO2 where the alkyl and aryl substituents may themselves be substituted or unsubstituted.    An INDEPENDENT CLAIM is a method of producing the rechargeable battery, comprising: providing a first electrode and a second electrode, separated by an ion-conducting barrier; providing a molten salt comprising quinone or quinone derivative A having the structure of Formula I at the first electrode, and a molten salt comprising hydroquinone or hydroquinone derivative B having the structure of Formula II or the structure of Formula III at the second electrode.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of a rechargeable battery.    Stainless steel body (2)    Rubber seals (4)    Teflon screws (6)    Swagelok air tight fitting (8)    Current collector (10)    Electrode (12)    Steel/electrode electric contacts (14)    Chamber (16)