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Sustainability is one of the hot topics of today's research, in particular when it comes to energy‐storage systems such as batteries. Redox‐active molecules implemented in organic batteries represent a promising alternative to lithium‐ion batteries, which partially rely on non‐sustainable heavy metal salts. As an alternative, we propose benzothiazole, ‐oxazole and ‐imidazole derivatives as redox‐active moieties for polymers in organic (radical) batteries. The target molecules were identified by a combination of theoretical and experimental approaches for the investigation of new organic active materials. Herein, we present the synthesis, electrochemical characterization and theoretical investigation of the proposed molecules, which can later be introduced into a polymer backbone and used in organic polymer batteries. [ABSTRACT FROM AUTHOR]