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BMW and Hyundai investing doesn't mean nothing. But it also doesn't mean a lot. There are a ton of battery startups that have highly speculative investment from respectable companies. They invest because the prize is so big. If they really have done what they claim then it is worth many many billions.

Good for them... I still want to see the battery...

Produce 100 test batteries and send them out to labs round the world with a note saying "look what we made!".

Then when those labs post their results (and they will because testing claims like this on a battery is a simple and cheap process), then I'll consider investing.