On a related note: I made a thing At the moment I'm using my mate's old IPV v2 mod. It does the job, but it only reads resistance to 1 decimal place and getting the cover off to replace the battery requires a screwdriver (I don't trust the built-in charging circuit). Toyed with the idea of making my own mod back when the DNA40 was new; I didn't have a 3D printer back then, but I do now and DNA75 boards are ridiculously cheap! Nice mod . I didn't even know cells that size were a thing. Is there a mechanism to lock off the fire button?