Smok Al85 burning holes in batteries

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Hey guys!

I've had my Smok Al 85 for a while now. A previous battery I had in the mod, had 2 little holes through the battery wrap on the side near the top end(which is the negative side). And just earlier I noticed the same thing with a brand new battery I had just put in there. Anyone have similar problem or any suggestions?

Smok Al85 burning holes in batteries