[mdip]

I'll second that...

Now, I'll say, after 30-40 batteries, I've never had one catch fire. I've had a few that I probably broke as a result of heat, and I suspect that if you've tested the cells carefully and the batteries are in good condition, that they tolerate the brief heating better than cells that are already damaged, but that's not something I'm willing to bet my shed or my body on.