Found this2.4.2 Lithium–sulfur batteryThe lithium–sulfur battery...

Found this

2.4.2 Lithium–sulfur batteryThe lithium–sulfur battery is a member of the lithium-ion battery and is under development. Its advantage lies in the high energy density that is several times that of the traditional lithium-ion battery, theoretically 2600 Wh/kg, with open circuit voltage of 2 V. But the actual energy density is much lower than the theoretical value. For example, the actual value of lithium–sulfur battery developed by Sion Power is only 350 Wh/kg.

from https://www.sciencedirect.com/topics/engineering/lithium-sulfur-batteries

so if your calculation is near enough to corrrect, (as it appears to be possible given the above) this is a massive game changer!