https://www.forbes.com/sites/michae...SLzDPiyZx7vOLH8vyUjXhPhmidP5Q8ABkZbiY6aAkpkIgFast charge, comparable energy density, and no thermal issues at high current draw. To top it off, you get around the environmental and supply issues that plague Lithium based batteries, and they can be lighter since you don’t need the massive heat sink and cooling components (or at least much less of it).