Hot Batteries! Yowch!
So I got my TK40 today, and right away loaded it up with Energizer Ultimate Lithiums ( I dont have a recharge setup yet for AAs) and played with it for a while. Overall, I am pleased with the light.
Then, I put it away, unscrewing the end cap 2.5 turns as the little instruction manual says to eliminate slow battery drain...Can't say I was all that happy having to do that, but ok.
I put my hand on it about 40 minutes later and it was just about hot enough to cook something on! I immediately took out the batteries, and some of the lithium batteries swelled a bit, to the point that their outer foil/plastic jackets no longer touched at the seam.
What is going on? Did I do something wrong? I am admittedly a bit of a newb here but I've been lurking at CPF for a while and decided to try this light out.
Anyone have any ideas what's going on?