Got mine today.
1st use with fresh Sanyo NCR18650GA, ran turbo in the darkness when I took my dog outside.
After stepdown, temp was so hot could barely hold it. … shut it off and saw an orange glow in the head WTF?

I watched the orange glow fade, then took bezel off to investigate.

Optic was melted by a loose screw arcing near the burnt PCB hole in the head.

The threads of the screw were laying stuck on the burnt mark as seen in photo #2