As of my last knowledge update in September 2021, lithium-sulfur (Li-S) batteries typically have a voltage rating similar to other lithium-based batteries, which is around 3.7 to 3.8 volts per cell. This voltage range is common for many lithium-ion and lithium-based batteries, including lithium-polymer (LiPo) and lithium iron phosphate (LiFePO4) batteries.
However, please note that battery technology is an area of active research and development, and there could have been advancements or changes in Li-S battery technology since then. I recommend checking with more recent and reliable sources for the most up-to-date information on Li-S battery specifications.