IMO the actually hard part is getting the tech to work the same as it did in the lab when you put it through volume manufacturing. A lot of things seem to go wrong in this phase even when the battery chemistry works well enough to create a hand-crafted battery pack that would actually show long range. I really hope they are successful, but until they can show manufacturing working I will keep my enthusiasm in check.

How bout do both?

Phinergy did just that with their aluminium-air (primary) battery and yet they never commercialized their tech.