I'm new here...and new to sub ohm vaping. Just bought (online) an Eleaf 100TC box mod. It says it uses 18650 High Drain batteries. I've been to several web sites and I notice that there are lots of different 18650 batteries, 2500 mah, 3000 mah, flat top and so on. I haven't seen anything yet that says "high drain" batteries. I don't know what that means and so I am very unsure as to what batteries to order. I don't want to order batteries that are too weak, or too strong or something that's going to set my part of town ablaze. Can someone explain batteries to me? Thanks.