I found more information. Their battery have 2.5x the energy density of conventional lithium batteries. And suposed 1/3 of the cost.
https://www.nextbigfuture.com/2017/1...-the-cost.html
Cost per KW or cost per unity of same size/weight?
Probably cost per kw.
Strange, cause solid state batteries are told to be very expensive to manufacture and not positively affected in cost by mass production.