This sort of technology answers a lot of the issues I have with the idea of big batteries as the sole solution to low carbon transport.
They problem is that batteries are not reducing in cost and weight anything like as fast as batteries everywhere advocates imagine.

Here is a 'survey of surveys':

https://www.greencarcongress.com/2021/08/20210803-m%C3%BCnster.html

' Further, the researchers consolidated 360 extracted data points into a pack cost trajectory that reaches a level of about $70 (kWh)−1 in 2050, and 12 technology-specific forecast ranges that indicate cost potentials below $90 (kWh)−1 for advanced lithium-ion and $70 (kWh)−1 for lithium-metal based batteries. '

So for 2050 we have costs for a BEV with decent range of the order of $4900, the sort of price of a cheap car in places like India where the growth in car ownership will heavily increase.

This is compounded by two issues:

The first is ramping up critical materials fast enough to carry out a fast switch to all BEVs

The second is that the overwhelming majority of people have nowhere at all that they can reasonably plug in.

So I would suggest that a variety of solutions are preferable, with a variety of compromises.

Here is one, an ICE RE capable of running either on gasoline or methanol, in the latter case without emissions other than CO2, but even then with a substantial plug in capability only needing it on a run, which is the bit which makes users lug around hundreds of kilos of batteries, which in reality with present toxic emissions now overwhelmingly from road dust and tire wear, mean that a big, fat, heavy BEV in running emissions as well as production is one of the most polluting cars on the road, not the least, save of course for the weasel worded 'comparable ICE cars' which means non hybrid, having equally 'ludicrous' acceleration and so on.

https://www.greencarcongress.com/2019/07/20190714-nee.html

I do not understand their comments on stamping. Stamping is an incredibly low cost and productive method of production. The only way printed circuit board technology could be lower cost is for making prototype where the cost of tooling would need to amortized over a small run.

They apparently only need to have 5 kW average power so why not just use a 50 or 60 kWhr battery and be done with it. The energy cost would be far less, the maintenance would be less and probably the initial cost would be less and maybe most important, you would not need to deal with the problems of using hydrogen.

@Davemart

I think that the survey of surveys that you referenced shows the problems of making projections when you do not know enough about future developments. Imagine projecting the cost and size of a cell phone before transistors let alone integrated circuits were available. I think that we are already close to their projected cost for 2040 or 2050. I believe that by 2025 or so we will have lithium sulfur which uses lower cost materials and has a much high energy density.

Forget Li-S.
https://www.electrive.com/2021/08/22/gac-aion-v-charges-in-8-minutes/