Unlike many other MOFs, the copper-triazole MOF synthesized in an aqueous solution is stable in water so the battery cell requires no control of humidity or may use an aqueous electrolyte. It is demonstrated that the MOF shows excellent electrochemical stability in the pure ionic liquids. The redox potential for the halogenation of the MOF is about 0.6 V or higher. The energy density and specific capacitance of the prototype cell can get as high as 7 Wh/kg and 10 mAh/g, respectively, that are in the range for practical use. Finally, a multi-cell battery is fabricated to power an light-emitting diode (LED).