MOST SPACE MISSIONS UTILIZE SOME FORM OF ENERGY STORAGE SUCH AS A BATTERY ON THEIR SPACECRAFT. THE NEED FOR LONG CYCLE LIFE HIGH ENERGY DENSITY BATTERIES WITH MINIMAL SELF-DISCHARGE AND ENHANCED SAFETY ARE THE MOST CRITICAL REQUIREMENTS OF ENERGY STORAGE SYSTEMS USED IN EXTENDED DURATION SPACE MISSIONS. VENUS PRESENTS THE MOST SIGNIFICANT CHALLENGE TO ENERGY STORAGE SYSTEMS DUE TO A COMBINATION OF HIGH TEMPERATURE (452 C) AND PRESENCE OF CORROSIVE GASES (CO2 CO SO2 AND N2). WHILE THE RECHARGEABLE HIGH TEMPERATURE SODIUM SULFUR BATTERIES HAVE BEEN PREVIOUSLY OPERATED ON SPACE-SHUTTLE FLIGHTS CONCERNS WITH THEIR SAFETY DUE TO THE HIGHLY REACTIVE SODIUM METAL LIMITED ENERGY DENSITY (THEORETICAL = 760 WH KG-1) CORROSIVE DISCHARGE PRODUCTS AT 100% DEPTH OF DISCHARGE AND USE OF SOLID ELECTROLYTE WITH POOR MECHANICAL STRENGTHS AND IONIC CONDUCTIVITIES (E.G. BETA-ALUMINA) POSE LIMITATIONS FOR THEIR USE IN EXTENDED DURATION SPACE MISSIONS SUCH AS TO VENUS. IN CONTRAST THE LITHIUM SULFUR BATTERY HAS HIGHER ENERGY DENSITY (THEORETICAL = 2735 WH KG-1) IS SAFER DUE TO THE HIGHER IONIZATION ENERGY OF LITHIUM VS. SODIUM AND ITS DISCHARGE PRODUCT LI2S IS NOT CORROSIVE. THIS PROPOSED RESEARCH WILL EXPLORE THE COMBINED CAPABILITIES OF HIGH ENERGY DENSITY LITHIUM SULFUR BATTERIES INCORPORATING SOLID-STATE HIGHTEMPERATURE STABLE SUPERIONIC (LI+ ONLY) ELECTROLYTES INCLUDING PHOSPHATES GARNET-TYPE METAL-OXIDE CERAMICS AND SULFIDES THAT CAN ENABLE OPERATION OF HIGH ENERGY AND POWER DENSITIES HIGH CYCLE-LIFE LOW SELF-DISCHARGE AND HIGH SAFETY RECHARGEABLE MOLTEN LITHIUM SULFUR BATTERIES IN VENUS-LIKE CONDITIONS.