What are the rules on weapons and power ups?

Take Batman vs Superman.

If Batman uses kryptonite to beat Superman is it really Batman who won the fight or is it the kryptonite?

Uh, Batman. That's like saying if Superman killed Batman with heat vision, the heat vision won, not Superman. Welcome to the forums btw.

^But Superman heat vision came from him, its his own ability from his own body. While Batman found Kryptonite and is using it as a weapon. It didn't come from him at all.

^That doesn't make sense. So if Batman wins a fight with ANY gadget, he didn't actually win?

Batman with the suit vs Batman Naked.

Batman with the suit doesn't really win, the suit won.

.......................

This isn't a battle.