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Diversification of the use of spent battery is needed to increase community participation in the management of hazardous waste by re-utilizing the spent battery component and processing its to increase economic value and use it into other products. The component of spent battery that can be used again are its carbon rods and electrolyte paste, which are as an electrode for the process of purifying water, processing waste, supercapacitors as energy storage or reverse electrodialysis power generation. One of the important criteria in electrode selection is electric conductivity, besides porosity and surface area of particles. Hight electrical conductivity will make it easier for electrons to flow, while large porosity and outer surfaces will increase the conversion of ions into electrons in the electrodes. The aim of this study is to find out the best electric conductivity from mixing carbon rods and electrolyte paste spent batteries in carbon electrode application. The carbon rods spent bateray contained 94% carbon and the electrolyte paste of spent battery contained 64% Carbon, 19% Zinc and 5% Manganese. Before mixing, carbon rods were made powder with ballmils for 4 hours and produced with a size of <250 nm as much as 6% and 84% measuring up to 1 micrometer (1.000 nm). Carbon powder and electrolyte paste were mixed in a ratio of 9:0, 8:1, 7:2, 6.5:2.5 and by adding 10% PVDF and NMP as binders. The ingredients are mixed to form a gel then printed with the pressing and immersion method. The electric conductivity is measure by LCR meter and BET are use to measure porosity and surface area of the particles. The best electric conductivity is obtained from a mixture of carbon rod and electrolyte paste in a ratio of 7:2 with an electric conductivity value of as much as 2.7543 S/Cm, the porosity is 0.028 cc/gr and surface area is 15.936 m2/gr