Battery tray rusted, can't break bolt loose

Heat and spray water on it a few times. The rapid cooling will contract it quick and should suck some water into the threads. Like 4 times.suprised it didnt break. Heres where a wimpy impact comes in handy.
Shoot us a picture. If you cut it off you still have to get it out. You need a new tray, I think they have the braces too.
Page 550 of the Classic Industries catalog.