Except power armor actually drains energy which needs to be replenished. The only way to drain a portal gun of energy is to throw it in lava
That my issue with that mod. Every other mod that introduces really useful things - even EE3's minium stone, which I think is OP - can either be damaged over time, or requires some kind of energy in order to work. The Portal gun doesn't. It's a permanent advantage, and thanks to it spawning in chests, there's a random chance you won't even need to craft it. I wouldn't mind it if I would just play along with all the other electronic things that require energy to work.