I think you'll find that for regulated, if it fits 217, 207 will also fit.
I'd recommend 217's if getting a single battery one, they've came a long way since 207 was established.
Single battery DNA color screen isn't known for the best battery run time. It isn't bad, and there are varying factors. 75C's are my only single 21700 battery mods.(3)(+2-2x18650)
.4 is in my wheelhouse. When at that resistance I use less than 40W. More like 30 or less and I've used Vapecell G50 12-15A with great run time and runs cool. Its a Samsung rewrap but the Samsung label is/wasn't available (50G).
Just bought some batteries and switched to 50S. Mooch rates them at a temp limiting 35A, 25A continuous, and over 5100 mAh vs VC's G50 5000. I switched because I find myself sometimes wanting to up the wattage a bit but with the wrong battery(amps) in the mod. So these 50S keeps me from having to swap. They've been exc for regulated with great run time. I vape a lot, 20-25ml a day. I always thought mods should have a vape timer instead of a puff counter. I'll put a fresh battery in late evening.
Here's a good deal on a nice mod. I dare say ya can't find another new DNA C mod for $67. Very well made. Aluminum body, SS top/bottom/tube. One color left of the 3 variants. It's been out 2 1/2 yrs, surprised I ran across it a while back.
The authentic ZQ Essent Mod is a collaboration created by ZQ, YouTube reviewer Steamshots TV and Smartin TV. It is the most ergonomic box mod that is designed to have a firm grip and makes it comfortable in the palm of your hand, with The most advanced and customizable DNA 75c chipset designed...
www.3fvape.com
I have the gunmetal
View attachment 203034
View attachment 203035