Sakti3, just keep an eye on that name
 

A University of Michigan engineering department spinoff, experimenting in solid-state battery cell prototypes - energy density of 1,100 Wh/l - twice of lithium-ion batteries, 'No God (or material) machines'! They have great potential that global multibillion-dollar engineering giant, Dyson has invested millions on Sakti3 technologies. Smaller batteries same charge longevity. They may start at home and personal electronics but a huge EV market has the greatest potential. Tesla don't build that Gigafactory just yet...
Sakti3: The Next-Gen Battery Company You Need to Know About

One link to the Dyson deal:
Dyson charges ahead with battery-maker Sakti3 - CNET

1,100 Wh/l means you could theoretically replace a small cars gas tank with a same sized 50 kWh battery, and it would have a range of over 300 km/ 200 miles.

It would be at least twice as heavy as a full gas tank - but the EV motor would be much lighter than the ICE and ICE specific systems (cooling, exhaust, alternator, intake).

Battery energy density and cost are key developments in the electric vehicle design.