The effect of the Ni/Fe ratio in the anode composition of Fe-air rechargeable battery using LaGaO3-based oxide ion conducting electrolyte was studied in terms of the discharge performance, including discharge potential and stability of anode. A Pure Ni anode showed no potential plateau during discharge, and the cycle stability was significantly low. The highest stability and discharge potential was observed for a Ni-Fe (90:10). When the anode contained a large amount of Fe, such as those with ratio of Ni-Fe (30:70), the cycle stability was low due to the aggregation of particles with an increasing number of redox cycles. Copyright (C) 2014, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.