I've been using my Tesla Steampunk nano 120 for almost a year now. Its my only vape and I use it everyday and since last month I noticed that the mod doesn't read the baterry so I have to slightly hit the mod so that it reads the battery. This usually happens right after I charge my battery ( I use an external charger). But right after I hit it and it reads the battery its usally okay right until the next time I charge the battery. I'm not sure if there is something wrong with my mod or with the batteries (bought it at the same time) and I don't have extra batteries to test. Has anyone had the same issue?