The Horizon MINIPAK’s mobile hydrogen fuel cell battery had been announced that it would be available to buy in Japan quite some time ago.
An iPhone can be fully charged twice connected to the MINIPAK by USB and powered by a hydro-stick filled with hydrogen with a charge capacity of 12 AA batteries.
The hydrofoil hydrogen generator is sold separately and fully replenishes the hydro-stick from distilled water in about 3 hours.
However, the irony of the hydro-stick is that in fact it requires power to be charged …
If connected to this solar panel, storage is enabled by it undergoing a natural conversion of energy from sunlight to electricity to hydrogen, to put it in more simple terms.

Horizon MINIPAK
Horizon Fuel Cell Japan