Densities, viscosities and ionic conductivities of single salts and the binary eutectic mixtures of alkali bis(trifluoromethylsulfonyl)amides, MTFSAs (M=Li, Na, K, Rb, Cs), were measured in the temperature range of 413–573K. Cyclic voltammetry revealed that the binary eutectic melts have wide electrochemical windows of 5.0–6.0V. It was found that alkali metals reversibly deposit on a nickel electrode at the cathode limit potentials. The order of the deposition potential was determined to be Na>Li>(K, Rb, Cs).