I have dual terminal batteries, post and threaded stud that are part of an interchangeable golf cart/Electrak set.

I can not unscrew the stud nut (cross threaded?) because now the stud is turning instead. I have to get the connected wires off (I removed them from the cart at the other end) and have to resort to grinding the nut off which i plan to do in the middle of the driveway. 

Do I run a risk of sparks igniting sulfuric acid fumes? I would assume the stud is not usable if it will now spin. I have found a post clamp that has a stud on it that should work. Thoughts?

Mike