skydog

Hello, guys, i am quite new to vaping and I'd like to ask you a couple of questions. Yesterday, I bought myself a vape with the following configuration:
1) smok tfv12 tank (with preinstalled smok v12-t12 atomizer)
2) CigGo Praxis Vapor Banshee 150W TC box mod
3) 2x Avatar 2000 mAh 20A 18650 batteries

As far as I understand, the coil that I use has a low resistance (0.12 Ohm), and therefore i should vape at 120+ watts. I notice that after a few minutes of vaping the tank and the mod become warm. The tank seems to be getting warm due to the heating of the evaporator, but now with the mod itself I had a question. I conducted an independent investigation, and I realized that the batteries were getting warm. I read a few articles and understood that the batteries should not become hot on their own. Tell me please, what could be the problem. Are these batteries bad for this vape or what? Moreover i see that my mod has temperature control. Is is OK to use stainless steel TC mode with my atomizer? Or better just use 120+ watts?

Welcome!
You are correct, the tank is getting warm because of the heat generated by the heating of the coil at high watts... think of the heat of a 100W light-bulb, and you're going hotter than that... in a very confined space...
As for batteries getting warm, yes they do that as they produce power (discharge).  I do not know the brand "Avatar", and probably would not trust them to be true 20A batteries.  If it were me, I would invest in a QUALITY pair of Samsung 25R (green wrapper) or LG batteries (HE2, HG2).  The ones I mentioned are TRUE 20A batteries and larger capacity (2500mAh or 3000mAh).  I regularly use (and trust) these batteries and never have them get warm on me, even when pushing a single battery over 60W... or dual batteries over 120W.