the grey ultrafires were the same ones the OP had trouble with. I use the trustfire flames and the aw +power in mine and i dont have the heating problem
Maybe you were thinking of another thread. I'm the OP here & it wasn't a battery problem. I'm using the TrustFire flames as well. Turns out that I had a defective box mod, and madvapes is replacing it. Hopefully, problem solved.