A method for manufacturing an electrode assembly. The electrolyte mixing apparatus thus prevents the electrolyte in the battery from being formed in lower- and higher-specific-gravity layers according to specific gravity. A first exposure is performed with a first photomask that comprises a plurality of diagonally allocated square patterns wherein the square patterns on the first photomask are tilted at an angle of 45 degrees. Additionally, the client device is implemented to present the interactive media guide to the user.