So been using an 18650 IMR in my mech mod on my AGA-T for some weeks now. If I ever had a question about my battery level I would pop it in my eVic. Bought some AW IMR 18350 to use but dont have a 18350 tube for the eVic. So how can I test my battery on the go without getting a 18350 tube, or is there a way to know when to stop using the battery before it undercharges?