Sorrow said:
It's own reactor with enough fuel to power it for a hundred years, afterward it has to be refueled using micro fusion cells or small energy cells.
I don't think that's how it works. I mean, it's not like the armor has a battery compartment. The fusion pack is a built-in component of the armor that would probably require outright replacement once it ran down, or at the very least, a touchy replacement procedure for the fusile materials which involved highly specialized equipment.
Then again, you *did* ask for
Enclave Power Armor, which may well get you off the hook: I don't know what it says in the FO Bible, but the armor's in-game description says nothing about the armor's power source OR it's prospective lifespan.
Of course, by the time the batteries ran down, you'd probably be a little too dead to care anyway.