Really confused right now. They had microfusion power ever since Fallout, as perishable ammo and power armor that never ran out of power. Which itself must mean that whatever amount of energy it takes to fuel a robotic exoskeleton for 100 years, is a fraction of the energy that an energy weapon can use in a single day. Which means it really can't be a nuclear battery as we understand it, and that calling both microfusion may be misleading. Either way it's pre-war tech, but every instance of an actual reactor appears to be fission until the later titles (e.g Candle fusion power in Hidden Valley, and everywhere in the game that shall not be named). So they had a small scale version that couldn't be scaled up, otherwise why was the Enclave using fission reactors?!?. I just thought the story was that fusion power came too late. Everyone was at war with each other, enemies all around, and America didn't want to share but they had it (hence the powered armor, laser and plasma weapons, and maybe the ubiquity of robots?). So where is it? I just don't understand what they were going for on this one.