Strange marks on box mod base

[Kurkikohtaus]

I’m using a Smok G320, some time ago some strange marks appeared on the base. (See picture)

I stand it on various surfaces while vaping, including a concrete balcony floor, but that big circular mark in the middle doesn’t really look like a scratch ... any ideas what it could be?

I don’t think there is a problem with the batteries but that would be my chief concern. I use an external charger and the inside of the battery case is not damaged or discoloured.

 

[Droogbc]

Probably just a high-spot that happens to make contact with whatever you're placing it down on before the rest of the panel.

Cheap mod, cheap paint. It happens.