The battery is important power sources of medical devices such as pacemaker, neurostimulator, etc. The batteries like Li/SVO, Li/I2 and Li/CFx have been used as power sources. Li/S battery has a high theoretical energy density of 2600 Wh/kg, which is much higher than that of those batteries.[1-2] The selfdischarge property of battery is one of the crucial facts for commercialization. Ryu et al[3- 4]. reported the self-discharge property of Li/S cells at 25?