I have learned this the hard way, but this is a learning experience so mistakes will happen. My first lesson learned is BE PREPARED! I am now basically out of liquid. I am sucking on dry cartridges trying to get every little bit out. My next shipment wont arrive until Wednesday so I have to survive the rest of today, and then tomorrow before I can vape my brains out again. Also, don't hesitate to bring extra things with you when you are out and about. I was at the club the other night having a blast with my friends and vaping away. I go to take a hit and I am not getting a flavor. I look down at my Tornado and my battery is dead . Luckily the club was closing shortly so I could go home and get my other battery. I have been analog free since I received my kit last Friday. Still going strong. Might have to bum a few off some friends though because I learned the hard way, BE PREPARED!