Batman's superpowers, if it can be called that, is writer's fiat. Whatever situation he is in, the writers think of a contrived way to get him out of it.
When he needs to, he can defy the limits of the human body and do amazing things. He can hold his breath for a very long time.
When he needs to analyze something and does not have a way to get to the bat cave, he just declares that a batcave exists in that part of Gotham and boom it does. Awfully convenient that a Bat Cave just exists on Arkham Island, Wayne Tower, and underneath Wayne Manor.