Yup, just like the last thread regarding Kanger hardware. I'm now getting the same issues with the ProTanks, but with no possible answer in sight. I attempted to Google search anyone else on the face of this planet who is having this same problem, alas my efforts were in vain... Here's the thingy: I think it relates to using 2 different types of batteries: My eGo-C Twist battery - which it mostly works fine with, and then there's my eGo-V2. 90% of the time, when I'm using a clearo (or glasso?) on one type of battery, it won't work on the other type. I've tried adjusting the head by loosening or tightening, tried cleaning it out, all that jazz but to no avail. The frustrating part of all of this is that it seems no-one else has this problem. My batteries are reasonably clean, I've done the aforementioned clean-up methods necessary for the clearo itself... Most of the time, I've ended up having to use a new coil head and just hoping it works with the eGo V2. I'm lost!!