Was wondering if it's okay to use a single battery back and forth between a mechanical mod and a regulated (single 18650) device. Going to be adding a New mech into my rotation but am debating whether or not I need a separate battery for it. I have already have 2 sets of married batts (but I for sure don't plan on Using any of the four in the mech) and have 2 other batts that have been used in my ipv D2's. Would it be alright to use the batts I've been using in my regulated device in my mech or should I buy a new one? Sorry if this is all just a waste of breathe lol I'm just worried about the overall lifespan of my batts