I have a 2017 S60 and my battery posts are not deformed. Maybe this is more of a car battery question. My wife has a 2016 Acura RDX and the negative battery post looks like someone hit the post with a hammer making the post look somewhat like a mushroom. Calling the Acura dealer they said, that this can be normal due to the soft lead metal post. Is that true? I have never had this experience before. The problem with this situation is that I can't take off the negative terminal.