Been vaping this mod for a few months now in a couple of weeks it showed up but didnt look that bad went into a vapeshop and asked about it they said its natural and u just need to clean it with an pen eraser. Tried it and it got kind of clean but now its bothering me alot cause i keep getting hot button. Anyways i am subohming with it 0.1 ohms.(pleas dont call me an idiot i have done my research i know how battery pulsing works and such but im not an expert i think the reason is why it turned out like this is probably cause of the mod button not being flat enough or some issue with the nod.(limitless mech) im intrested in knowing are these batteries still safe to use/cleanable?