Hello, I'm new to rda/sub ohm builds & have a couple questions regarding the batteries I have and my sub ohm builds. I bought 6 Purple efest 35a batteries from a local vape shop I bought my first mech/rda from. Are these safe to use for my builds of .15 to .40 ohms? Second question, I kept reading all the negatives about these batteries so I did a little research and bought 4 XTAR 30amp batteries because I read on here that they are re-wrapped vtc4's. Is this correct? Also, when using these batteries on my mods, I notice on all of them (nemesis, caravela clones) the batteries(flat top) do not fit properly and I have to unscrew the top and/or bottom cap in order for them to fit and fire. Is this dangerous? I attached a picture of what I am talking about. I've tried adjusting the bottom and top pins to no avail. If I do get them to fit they dont fire Thanks in advance!!!