I have that Samsung battery and it gets good runtime and nice headroom (I am not a high wattage vaper). I have a two battery 75 watt mod that is a DNA mod, (Steamtuner's mod) but it's not a C. LOVE the accuracy and the battery life but if I were to get any DNA mod it would be a Jac B or a Lost Vape mirage. Probably the 75 model because I get just fine battery life.
Efests are really not what you want nowadays, there are tons of better batteries out there, to be honest. Good luck, if you want the latest and greatest info you could check Mooch's blog he has a table and list of best suppliers. I'll link it (you may already know it) but welcome back!
https://www.e-cigarette-forum.com/blogs/mooch.256958/ The table (which I can never seem to post successfully) is just helpful as are the list of vendors etc. Baditude's blog is good for battery stuff as well.
I don't see you having a connection problem, honestly. Anything can happen, but worst case, it means you also buy a more up to date tank, but I'd be supremely surprised if it didn't work. Etc
Anna