I know this thread is from last month, but just wanted to say for those who hate buttons, think a noob might take better to a no-button system, or sometimes just want to hold something like a regular cig -- that I have had great luck with the Joyetech XL auto battery, rated at a decent 340mah. My friend, who is a light smoker, loves hers, has no desire for anything else; I'm a former hard-core smoker and heavy vaper who enjoys switching from these to other units, and I like them for public use. We each got two black 510-T starter sets with a total of 4 batteries, through MyFreedomSmokes.com, 3 months ago. They still sell the batteries by themselves; not fond of the purple lights at the end, but have never had a problem with them. They put out a lot of vapor, with decent battery life. The 510-T atomizers have not ever leaked on us, so battery damage has not been an issue. If you were to use cartos on them, then leakage might be a problem. There are XL tanks available elsewhere that hold more liquid. I also use mine a lot for testing out new DIY juices as it only takes a few seconds to remove all the liquid in the tank with a syringe, and fill it up with a new concoction, flavor changes quickly with small 510-T atomizer.