Owing to an increasing demand on high performance and rare‐metal free energy storage systems, organic rechargeable battery has attracted much attention. To increase the capacity of the whole battery, we have fabricated coin‐type buckypaper cells composed of a trioxotriangulene neutral radical derivative (H3TOT) and single‐walled carbon nanotubes as a cathode and lithium metal plate as an anode without current collector. The cells exhibited a stable charge‐discharge behavior even at a 90 wt % H3TOT content with a high‐rate performance of 10 C originating from high electrical conductivity of H3TOT. Furthermore, based on the four‐stage redox ability of H3TOT, the H3TOT 90 wt % cathode showed a high capacity of approximately 260 mAh g−1 and a high energy density of 546 Wh g−1. In view of the simple fabrication of the cathode and excellent performance, TOT‐based buckypaper will open a new strategy for the flexible cells for next‐generation energy storages.