I was finally able to resurrect the voice-box that came with BotCon 2001 Arcee by scraping away enough of the corrosion, and hooking up a new battery. That was one thing I really feared I had lost, as there was significant battery leakage on that one, and they were only button-cells too.
It was great to hear Arcee's voice once again, after 12 year since I'd heard it last.