In my limited vaping experience, the tank upgrades I have made have made more of a difference to the quality of my vaping than the battery I use.
I completely agree. I was happy for some time with the small kangers, the T3S and Mini PT II, especially after I learned to rebuild them, but I did keep having issues with the wicking -- too much, dry hits, not enough, leaking. Then I got a kayfun lite plus (clone) and the taste is just so much clearer, I've pretty much retired my collection of T3Ss -- plus, zero leaking! Still use the Mini PT IIs, since they're glass, and holding such a small amount, are a good choice for flavors I don't vape a lot of, and I don't seem to get as many leaking issues with them as I did with the T3Ss. Since I started wicking the Mini PT IIs (and my ARO Pyrex) with rayon, I don't get the dry hit issues either.
A lot of people seem to believe that the battery tube (or box) is somehow responsible for the quality (or lack of it) of their vape, but all they do is power the atomizer -- the atomizer, the tank, has far more to do with the quality of the vape than whatever is powering it. The only real issue I've had with the power source affecting the vape is when my Sigelei was, for whatever reason, factory-set to "Mean" mode, and that was making it kick out about 1.5-2 times the power selected -- which meant a real lot of dry hits and burnt tastes. Once I got it set to "RMS" mode, then whatever power I selected was a great deal more accurate, and the vape improved accordingly.
Andria