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Lithium–sulfur battery

The lithium–sulfur battery is a type of rechargeable battery. It is notable for its high specific energy. The low atomic weight of lithium and moderate atomic weight of sulfur means that Li–S batteries are relatively light. Wikipedia
Charge/discharge efficiency: C/5 nominal
Cycle durability: disputed
Energy density: 550
Nominal cell voltage: cell voltage varies nonlinearly in the range 2.5–1.7 V during discharge; batteries often packaged for 3 V
Specific energy: 450