Okay, I know you don't want to talk about the Comic, but for what it's worth, here are the factors that allowed Batman to 'win':
1. Nuclear Weapons. Superman, days before their confrontation, had been Nuked. This took such a tole on his Body that he was reduced to a walking Skeleton until he stole the energy of a field of Sunflowers to recover. The subsequent Fallout led to a Nuclear Winter, which meant Superman wasn't able to be fully charged.
2. During the fight, Green Arrow shot Superman with an arrow made of Kryptonite. Whilst it did not kill him as he caught it before it struck, Superman was still weakened by the arrow.
3. Batman was in a powered suit of armor. On a one to one basis, Superman would have and could have crushed Batman into a thin paste. Batman knew this fact and used a suit of power armor during the fight, which leads too...
4. Batman knew Superman wouldn't kill him. They're old friends, at several points in the comic sitting down to talk before the fight. During the fight, Supes pleads with Batman to stop, even whilst being pummled. The one or two hits Superman doesn't hold back on, even in his weak state, still send Batman flying. It's also worth noting that Superman, even depowered, is still physically strong, such as the time he broke Lex Luthor's jaw after the other had stripped him of his super strength.
5. Finally, Batman does not win, they draw. Whilst arguable that had Batman not had a heart attack at this point he would have defeated Superman, they still drew, the fight ending with the battered Superman cradling Batman's near dead body.
So yeah, Batman doesn't have a chance. If he just strapped on that armor and fought Superman toe to toe, literally nothing is stopping Superman from throwing him into the sun or tearing him out that armor. Also, we are shown that Superman will kill (When it's most necessary) and doesn't care for collateral. In short, Batman is fuuucked.