I think the problem, on further reflection, may be more because the battery is in a potentially active circuit rather than just being there. So maybe disconnect the posts on the battery of a reserve vehicle?
So you are saying the battery isn’t what is subject to damage but rather electrical components in the vehicle? Would that be just a computer or other sensitive electrical components? Or all?
I have to keep the batt. cables off on the ‘59 as it is. Got an electrical leak somewhere I haven’t been able to trace.