I am brand new to vaping. I bought my first yesterday and know nothing about it. I have a few questions and appreciate anything you can tell me. I bought a Kanger Tech P1308. I was hoping there would be a booklet to explain some of this to me but it only tells you how to put it together. First I need to know about how long the battery last. I do have 2 but I'm not sure when I should take the second with me and recharge the first. I have 5 spare coils with this. How long does a coil last? How can I tell it needs to be changed? I did read your FAQ which brings me to another question. LOL What is the difference between VG and PG? And how do I know which one I have? I am hoping to quit smoking and giving this a try.