$MULN "Mullen believes that technology, like all things, should be efficient, economical, and easy. Consequently, we are actively developing the next generation of electric vehicle batteries, including advanced technology like Lithium-Sulfur and Solid State.
Lithium-Sulfur batteries far exceed the industry norm, Lithium-Ion batteries, especially when it comes to weight and cost advantages." https://www.mullenusa.com/battery