Yesterday my old faithful SC600 was on EDC rotation and I accidentally left it on on high and put it in my fleece pocket. There was a newly charged samsung 18650 in it. It stayed there for 30-40 minutes before I felt the heat and pulled it out. It was too hot to touch and I believe it was higher than 180 degree.
And it survived! So did the 18650.
I am really impressed about its quality!
Usually when something very conductive like aluminum reaches 60C (140F) you barely can hold it in your hand, great chance you would drop it.
I did get a burn in my finger tips. Used a towel to turn it off. 
I guess then it was at least 140F, but 180F is something really really hot.