No, definitely not swapping any batteries! I even keep my single battery mods with the same battery just so everything is consistent and don't mix brands or specs but can anyone answer why do you need to set whether you're using 2500, 3000 mah and what calculator with dna 200 or 250 but nothing on dna75! How does it know what I'm using or even whether it's an 18650 or 26650! I have a couple dna75 mods using ijoy 26650 for added battery life and I don't even know if it knows the difference? So am I even getting more battery life before needing charge vs using a 25R for example? It seems that all you can set is the two choices which I think are lithium 18650 or the other setting! Why is this?? Thanks in advance!! All of you have been so helpful already that I can't thank you enough!!!