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Polyanionic sodium anthraquinone-2,6-disulfonate (Na2AQ26DS, 130 mAh g−1) is employed as an organic cathode for K-ion full cells, where the reduced-state graphite (K-intercalated state) is used as a starting anode material. The resulting full cells can deliver average capacities of ~105 mAh g−1cathode for 250 cycles (100 mA g−1) and ~64 mAh g−1 for 2500 cycles (500 mA g−1). These results are among the best K-ion full cells based on organic cathodes reported to date. Keywords: Sodium anthraquinone-2,6-disulfonate, Organic cathode, Polyanionic character, K-ion full batteries