[know.your.why]

Aaaand the catch is?

Its horribly expensive? It only comes in a capacity that will power a wrist watch? If this thing was a going concern, it wouldn’t be on freerepublic.com

[Red Badger]

Aaaand the catch is?

Indium. Cost is about $15 per ounce.

https://www.amazon.com/dp/B071FY6JG3?tag=bravesoftwa04-20&linkCode=osi&th=1&psc=1&language=en_US