pretty much yea but if you short them it's gonna melt stuff and catch other stuff on fireI was under the impression that the fire risk was non-existant with these batteries.
I wouldn't trust wood shelves though, not long term.. These will be in there decades ideally right? Unless it's like a 2x4 under it then yea maybeIn the closet I was going to use 3/4 board as a shelf. 3/4 has a 100lb live load per square foot at 24" spacing with .067" deflection, which should be acceptable.
You're not supposed to touch the steel to the batteries!