I use several different batteries at different times. I wait tables so I have an e cig on me at work all the time, I use kanger s1s in my apron because it has a cap over the mouthpiece which keeps random gunk from getting into it. Right now at home I use an eGo-C pass-through charging battery, but I'm going to start looking for an upgrade for it soon. I'm also looking for a good long lasting mod for general running around when I'm not worried about spilling food on it.