I have a 30 watt sigelei tube mod that I just bought batteries for. I bought Sony vtc4 batteries that are flat top. My efest battery fits that has a button top. My question is can the cap that touches the battery be adjusted? I wish I could put pictures, it has a center pin thingy that has threads in the middle.i want to try out the battery to see if they are authentic. Is there any way I can make sure they are real?