It seems like a lot of rare earth materials to build so many big batteries. Lithium-ion cells actually don't necessarily require any rare earth metals at all.

It seems like a lot of rare earth materials to build so many big batteries. Lithium-ion cells actually don't necessarily require any rare earth metals at all. For instance, the batteries Tesla currently uses for their cars are made up of lithium, nickel, cobalt, aluminum, and carbon, none of which qualify as rare earth elements.