Howdy, Just opinion........
Do yourself a favor, just buy the battery and get a Freemax Starre V1 tank for it (not Pro). Promise you will have better flavor and a solid set up and may even be cheaper! Yes I have used and own this. My flying/vacation/travel set up.
If you really want an RBA head then put a Subtank Mini on it instead of a Starre V1 but IMO your flavor won't be as good.
Good luck!