I've seen this guy a few years back on Discovery Channel and I laughed my ass off.
"an invention is unpatentable if it would have been obvious to a person having ordinary skill in the art"
Anyone with minimal knowledge in mechanics and electronics can think about a radio powered by a hand crank. No one has had the nerve to patent it because it's OBVIOUS it can be done, and there is no RESEARCH needed, and also there IS NO MARKET for it.
I have inherited a torch with a hand crank made in USSR from my grandfather and he died in 1984
I've seen a radio that was powered by thermocouples placed on a gas lamp (and it was a commercial product)
So there were other people to try to power small devices from something else than a battery.
His only "merit" is that he "found" the market in African countries. In my opinion he is just a patent troll who wasn't able to make it.