Hello everyone. I recently bought a thrunite t10, and the other day when i put in a new battery, i noticed a strange mark inside the battery tube. The pictures below show what i am talking about. Looks like a silver line, with some greenish spots. Anyone have ideas on what it might be?
Looks like they hung the tubes on a horizontal wire through the hole while anodizing. That's fairly common.
Space alien hieroglyphics,I say! Prepare for the end they are taking the world over. 
hmm, both reasonable answers
Does this mean that those who actually do the anodizing job are aliens ? Hmm… Sounds interesting. This would explain why they sell brands like “Uranusfire”.
probably bad machinery, it should be clean looking normally on great quality flashlight
It's anodized there, just the dye missed that spot where the hanger wire was. It's on the inside of the light. It's not a defect, it's just part of the anodizing process.
Damn aliens, taking jobs away from Earthlings. 
So would those spots be oxidation maybe? from the aluminum not being anodized?
There's gotta be a seam somewhere when the tube was formed/rolled.
Unless it was mold-formed, extruded , or God only knows and he ain't tellin..
I'm no expert, just my 2cent opinion.