I have never used an pv with a manual switch so this may sound like a dumb question but here goes. Do you HAVE to push the button to get a drag or if you do not push the button, will it act just like an automatic. I really want to get a 510 to try because I want a stronger hit with more vape. I am going to purchase from Thesmokesafe and the starter kit comes with 2 manual betteries so I want to make sure I dont need to buy an auto battery too. Thanks everyone