Batman may not have superpowers, but that does not mean that he is any less bad-ass. He is a master in almost every martial art, he is incredibly intelligent, and he has almost limitless amount of money. And Batman is one of my favorite, if not favorite, superhero. But, sadly, that does not make him invincible. So I have 4 other non-powered superheroes that could (possibly, not definitely) take down the caped crusader.
In most DC-Marvel showdowns, these two heroes are the most frequently paired together. And honestly, Batman usually wins most of the time. But it is heavily debated, and could go either way.
Captain America gained (semi-super strength, not enough for him to be considered to have super strength) a super soldier serum during world war 2, and was used by the America military as a soldier. And continued to work for the government, until he was frozen in ice, where he finally woke up in the 21st century.
But who would win in a head to head match up? It honestly could go either way.
Another match up that has been debated, because of their similar abilities. Black Widow was born Natalia Alianovna Romanova, or better known as Natasha Romanaoff. She was trained by, and worked for the KGB in her early years, and eventually switched to S.H.I.E.L.D. It was revealed that she was given a version of the super soldier serum when she was young.
Black Widow is also an expert at martial arts. This is another match that could go either way. But I think it is possible that Black Widow could beat Batman.
Probably the least known hero on this list, Wildcat is one of Bruce Wayne's earliest mentors. Wildcat was born Theodore Grant, and was a world class heavy weight boxer. Grant became involved in criminal activity, and took up the Wildcat persona to clear his name. He is an older member of the Justice League of America.
Wildcat is a very skilled hand to hand fighter and would definitely give Batman a run for his money (even though Batman has a lot of it).
You may say that the Iron Man technology gives Tony Stark his powers, but Tony Stark himself doesn't have any powers. And in my opinion, all the suit is is a big weapon. Like Bruce Wayne, Tony Stark is extremely rich, and is one of the reasons that he was able to build such amazing technology.
This match up has been talked about for a long time, and is still debated. And in some ways, Stark has an advantage on Batman, because of the suit. With that said, Batman is very resourceful and could hold his own.