The electrolytic conductivities and charge-discharge characteristics of Lithium electrode are examined in propylene carbonate (PC)- and ethylene carbonate (EC) tetrahydrofurans, such as 2-methyltetrahydrofuran (2-MeTHF) and 2,5-dimethyltetrahydrofuran (2,5-DMeTHF), binary solvent electrolytes containing lithium bis[1,2-benzenediolato(2-)-O,O ' ]borate (LBBB), Lithium bis[2,3-naphthalenediolato(2-)O,O ' ]borate (LBNB), lithium bis[2,2 ' -biphenyldiolato(2-)-O,O ' ]borate (LBBPB) and lithium bis[salicylato(2-)]borate (LBSB). The order of specific conductivities in PC- and EC-based equimolar binary solutions containing these organoborates is LBBB greater than or equal to LBNB > LBSB > LBBPB. The conductivity in LBNB electrolyte with higher viscosity than that in LBSB electrolyte becomes high. The PC-2-MeTHF and PC-2,5-DMeTHF equimolar binary solutions containing LBSB and a mixed electrolyte (LBBPB + LiPF6) show very high cycling efficiencies more than 90% at a higher range of cycle number. The EC-THF and EC-2-MeTHF equimolar binary solutions are moderate electrolytes with about 80% cycling efficiencies. It is found by using scanning electron microscope (SEM) that the films formed on the electrode in PC-2-MeTHF and PC-2,5-DMeTHF electrolytes with higher cycling efficiencies have a homogeneous surface with uniform grain size.