That's what I was thinking.. A trick that you probably all know already, that was taught to Chick, then he recently taught me...Carefully cut the bottom of the battery off, deal with the mess, clean out the case, pull the battery posts out and presto install a Mazda Miata battery in the case. Shim it up tight if need be, nice and clean and seal it up. Pretty cool idea by somebody years ago I'm sure.
Anyway, I have to think about it and see what to do, but I am leaning towards firing it up, we'll see.. D