Never tried it with battery acid, but at work when we want something have reasonable structural integrity and then "disapear" at the appropriate time we make it out of aluminum and put some acid on it when the time is right...works nearly every time depending on the amount of aluminum, acid type, strength and contact time. The acids we work with are Hydrochloric, Hydroflouric, Citric and Acetic. As I understand it batteries contain Sulphuric Acid which I don't get to play with much, but I bet it would do the same number on aluminum that the others do. I would say that resistance to acid would rank something like this (strongest to weakest) Stainless Steel, Carbon Steel, then Aluminum.
