Batman doesn't have any superpowers. None. He's just a martial artist who did a good job picking his parents, which allows him to buy cool gadgets.
I'm of the belief that he has two superpowers, which may be some implant that he gave himself and never gets mentioned in a comic. Enhanced reflexes, and enhanced healing. That's the only way to explain how he is able to recover from wounds that really should kill or paralyze him in a manner of days, and his ability to dodge bullets which comes up (rarely nowadays). Both of which would also have helped him become a better martial artist-enhanced healing would be pretty similar to steroid use for training purposes, and enhanced reflexes is something any martial artist could benefit from.... and hire good teachers and focus on training overseas. Without having to make a living.
(Wealth as superpower. )