I recently purchased a kick and planned on using it mostly with IMR 18350's in my telescope mod. When I put a fresh battery in, it works great until it gets to 3.7 volts. Once it gets to 3.7 or below, it starts to cut off and cut on again. It you listen to the atty, you can hear it turn on and off. I usually only let IMR's get to 3.4 but having to swap them out at 3.7 is a pain. Not much life in them even setting the kick on 7 watts. Is this normal or is something wrong with my kick?