Man, that sucks, Tec; sorry to hear it!
Years ago, I got myself into the habit of removing (or just not installing) the batteries upon opening my figures. I think that electronics are cool and all, but to me, they aren't a selling point, or a necessary part of enjoying what I've purchased. Sure, I might have missed out on some "incredible lights and sounds!!", but I've managed to keep my figures corrosion-free.