Tha battery in this pod system crapped out about a year ago+/-(estimating) And I wanted to change it for a while. A few weeks back I decided to open it gently for the sake of putting it back together in the same way. Well that didn't go as planned because I couldn't figure out how to open it without breaking the thing apart. I also couldn't find anything on this topic so I cut it in half. And I discovered it really was the little lipo that failed. I have been two minded about it, but these coils are quite popular so it wouldn't be a waste to fix it. I ordered a 18350 X2 but lockdown started that same weekend. Tested it and it still fired with old 30Q. Didn't have a battery that fit inside but I was also thinking a dual 18650 (replaceable) for those long days at work. Then I saw a pod system with dual batts Thanks @Puff the Magic Dragon and thought why not,but the battery sled I have would make it another project. No1 is the size difference and 2 is I would have to make a body. (Still pondering that idea) The main thing is the pod works and in future I will get this pod to look smart. Battery 3V didn't fire the chip. This is my test battery. Weak but works and hold voltage. And it fires So my next a with this pod is to figure out if I want a dual battery ,but suitable size. Or single. I'm worried about charging time and longlivety if it's fixed inside.