I had an AA leak and corrode in the little Gerber Infinity I keep in my BDU pocket organizer of handy things. Couldn't even figure out what brand it was that was in there, the plastic wrap around the battery was a uniform shade of gray. I got the battery out, and aside from the junk stuck to the inside of the barrel, it looks to be okay.
My dad ruined a Maglight I had gotten him for his birthday years ago when Maglites were still a "big deal".
Of course, he was working on the stove and had forgotten it in there for over a year.