Yes, the Persei is designed to run at any voltage and it comes with an adjustable-spring battery tube so you can fit a variety of batteries in it.. You can run a single 18650 at 3.7V, or double-stack 18350's for 7.4V. You can also buy an SS Kit for.. wow only 20 bucks now.. Those are "Super stealth" housings and would allow use of the Persei in "Shorty" mode with a single 18350. That is a really nice way to use a KISS cart or original EO cart.
Shorty SS tube with MT4 e-cig tank
Comparison of various Omicron and Persei. One Omicron with the HVD shorty tube and single 14250, other two Omicron with the SS tube. The center Persei double top is using a SS Long tubed, two SS Shorty tube, and then 3 "standard tube" Persei.
This is an old picture - I now have 4 vapes that take 18mm batteries (3 Persei and an 8) and have sold off half my Omicrons so far (I had 4 at one point) with more to go. I highly recommend the Persei over the Omicron b/c it's so much more powerful and versatile.