How about drones with a solar panel case? Would require a sunny day to work at all though.
Tiny nuclear reactor?
On the scale that useful nuclear reactors operate, a "tiny nuclear reactor" is the size of a shipping container.
Even a tiny RTG is in the same range as a dumbbell.
alt Hacker News
On the scale that useful nuclear reactors operate, a "tiny nuclear reactor" is the size of a shipping container.
Even a tiny RTG is in the same range as a dumbbell.