Yup the Vivi Novas will fit on an Ego battery. If you are using one of these (Ego) probably one of the lower resistance models (1.8 ohms ) would suit you best. The Vivi Novas look a bit big on Egos but the Mini ones look right at home. The only thing you need to do with these is stand them for about 10 minutes when you first fill them to let the wicks get good and soaked. After this first fill they are easy to use, easy to fill and very reliable.
A skirt for the Ego or a skirt to wear, while I'm vaping ? Lol
Best place to get said skirt ?