So, I'm deciding whether or not to purchase an e-lvt mod. I have a Russian 91 on top of it right now and it actually looks great and vapes great. I like all the functions and I think it will work well for my style of vaping. My only issue is that my efest 3100 batteries seem to be too big to fit into the mod correctly. I tried some lgs that I had laying around and they fit better (still a tight fit but the cover fits nearly flush). Are efest 18650s larger in diameter? If I do end up purchasing this mod, I will most likely grind on the back plate, just enough to give the battery a little more room. What do you guys think?