Hi. I built my first DNA200 mod earlier today. When I initially connected it to escribe all 3 cells where showing identical voltage values. After a few tests, one of which involved a shorted atomizer, the cells are now out of balance, and don't seem to be correcting themselves. Cell 1 has just been gradually decreasing to the point where it's now under 1 volt. The battery I'm using is a Turningy 2200mah Any suggestions ?