Not true. Alternatives to Li-ion batteries are not just lab...

Not true. Alternatives to Li-ion batteries are not just lab benchtop, nor they need "more than 3 years."

There are six commercial car models in the market that use hydrogen fuel cells: Honda Clarity, Hyundai Nexo, Hyundai Tucson FCEV[2], Mercedes-Benz F-Cell, Riversimple Rasa, and Toyota Mirai.

About the benefits of Li-ion batteries, see Nui comments in the Orocobre forum, 28/04/19, Post #: 38291647; https://hotcopper.com.au/posts/38291647/single

Fuel cells are not the only ion batteries in the horizon: Na-ion cells are also a serious possibility.

See https://www.chemeurope.com/en/news/156351/sodium-is-the-new-lithium.html

DYOR