Oh I remember EEVBlog tearing these things apart. They supply whooping microwatts of power and outside of extreme niche applications like low-power sensors they are absolutely useless.

These types of batteries have also been on the market for quite a while (for legit ultra low power applications). Every now and then some investment scammer tries to claim they're just about to run cell phones and cars with these things. They just need a few more million $ and a couple of years.

So yea, cold fusion and hydrogen cells.