Could You Design a Super Tiny Nuclear Vision Reactor?

Nuclear power is more like a nuclear battery, you have some kind of material there which has a lot of energy in it. It's sort of like just going to gradually give up some of its energy,. You can turn it into electricity and use it. The good thing about it is that the energy lasts a long time. Rhight, a little bit of fuel can last you for years or even decades. I think you could probably design a super tiny nuclear vision reactor. Just need really tiny tweezers to kind of put it together, basic.