1. Only two-electrode cell data were provided and analysed in this study, even though threeelectrode cells are also widely used in research for fast-charging supercapacitor devices to calculate the specific capacitance of electrode materials . 2. Electrochemical impedance spectroscopy (EIS) data were not provided for determination of resistance for simplicity. 3. The determination of internal resistance was not split into equivalent series resistance (ESR) and equivalent distribution resistance (EDR) . 4. As the participating groups were provided with datasets as measured in our laboratory, differences in electrode fabrication, cell assembly, and electrochemical measurements between laboratories were not assessed. Variations in the manufacturing process, including mass loading, electrode thickness, and pressurisation, can significantly affect device performance .