I don't know what others have suggested as I haven't read all the replies, but I def recommend you have a second or third battery, whether it be a twist or other wise. I actually think you should have a 2 batt kit first and foremost and then get a twist batt. and you should get LR cartos to start on/have a back up, cuz the Vivi Nova 2.5 and the Mini Vivi Nova have been nothing but problematic for me, no matter how well i wanted them to work, they just don't. Cartos and tanks are the way that worked for me, and what I have gone back to when things fail. Tanks out there can be bought for cheap. The Mini Sub Tank from momamdpopvaporshop.com is like 10 bucks, and it's a great tank. I have been almost 3 months off analogs, and I have ordered 4 kits for friends as they were clueless, and I got everyone kits and cartos and juice for under $100, this all lasted them at least a month. They are all smoke free now. I am very proud and glad I have helped everyone, and this is the place to go for information for sure.. I will say it again, the Vivi's are not for someone new that needs to really depend on their devise to be there for them.