I recently bought a joyetech egrip for something small but powerful to keep in my pocket at work. I like it but is limited by battery and airflow. Is there anything similar (mod and tank one piece) that is more powerful or has changeable batteries? The only thing I have found was one made by Yiloong the pinnochio mod - 18650 battery 40 watt 2015 Yiloong Creative Box Mod Pinocchio Mod Like Castigador Box For Genesis Atomizer - Buy Pinocchio Mod Product on Alibaba.com . I cant find this in any store online.