Like Kube, I have a couple of the older script batteries that have an Optima inside and was wondering the same thing. I was considering cutting around the bottom of the case and around where the posts come up through the top with maybe a hole saw the right diameter without the drill bit. There must be something there, either epoxy or a sealer. The bottom could be glued back on with a new battery inside with epoxy if cut with a fine tooth saw blade.. Has anyone tried something like that?
Didn't see the Ken/Alabama post, was replying to Kube's, Thanks Ken, will try that.