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Old Lithium Metal batteries were replaced by The shorter life Lithium-ion type because of safety issues

True techie stuff but a different approach to Lithium batteries could drastically increase charge size, battery life and safety.

Manufacturers swapped to the Lithium-ion batteries when the plain metal batteries started catching fire.

If the breakthrough is real we could see a doubling of current mobile battery life. Implications for the economics and usability of EVs are profound.

Still a lot of work to be done but breakthroughs like this tend to be fast tracked to market 

https://techxplore.com/news/2018-08-battery-breakthrough-lithium-metal-doesnt.html