I think it is compatible with the v9
No,
I've read elsewhere that although the vapor king is considered by some to be the best loontotem v9 "type" of e-cig, (because of the quality of the battery) because of the battery thread, it is not comaptible with the other models.
I believe Leaford did a review on them and did give it fairly good reviews and also mentioned this non-compatibility issue.
Note that they have not been out long enough to be praised as the best e-cig out there. The only FACT here is that due to the better quality of batteries, they are preferred over the other loongtotem v9 type models.
Last I heard (and it may have changed since then) that they were still working on the website and that orders were being taken via email. This proves my point that they are very new to the market and still has to be tried and time tested by end users whom of which, the end user opinions matter more here than video reviews.
Case in point, I ordered an Eaze Magnum based on a video review and it's been nothing but a nightmare for me for over a month.
So, let's not jump the gun here.