Just got my manual battery and some cartos from V4L I was using the V4L cartos on my LeCig battery with no problem. My LeCig batt needed a charge so I switched to the V4L batt. I noticed that the V4L batt did not have a groove cut on the center, the LeCig batt does. The V4L carto's have a groove cut in the center but the LeCig cartos do not. So, If I connect a LeCig carto (no groove) with my V4L batt (no groove), I can't get any vapor because there is no passageway for the air. Did I miss that discussion or is this something new?