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Any power generated by renewable electricity sources must be used immediately, or it will be wasted. In this research, battery cell test will be carried out using the Galvani cell theory and the electrolysis cell approach. Salt (NaCl) is an ingredient that can easily be found. Salt water is an element that is easy to electrolyze even though it uses a small current input. Salt water can also collect electricity in certain periods.This study discusses the use of salt or NaCl (Sodium Chloride) which will be combined with copper electrodes (Cu), carbon (C) and also aluminum (Al) as a storage of power generated from renewable energy sources. The results of the experimental analysis are how much power can be stored by salt water combined with magnesium and iron.