Yep, those nipples are a must for the provari. I learned the hard way last week-came across a site with a cheaper 18650 and thought I could save a few bucks-but no nipple-no provari power.
Wish I knew for sure, but I'm still impatiently waiting for my Provari (status still says "Processing". Ugh! Anyway, I believe from what I have read here and pictures on Provape's sight that it needs the batteries with the nipples.