The electrical conductivity of the chloride PbCl2-CsCl (28.7-71.3 mol %) and CsCl (18.3 mol %)-PbCl2 (81.7 mol %) eutectics with the PbO additions ranging from 0.5 to 18.0 mol % was measured depending on temperature and lead oxide concentration. The electrical conductivity of the CsCl (18.3 mol %)-PbCl2 (81.7 mol %) melt is found to be two times higher than that of the CsCl (71.3 mol %)-PbCl2 (28.7 mol %) melt within the whole range of the studied lead oxide concentrations at the same temperature. (C) 2016 The Electrochemical Society. All rights reserved.