I live in a small town, 1 shop that carries e-cigs and they are a cigar shop so help is not real great there. I have been researching online about vaping, but info is confusing. I need some help understanding some of the terminology. Here is what I have: I bought a Riva tank system with a Vision Cartomizer...They call it simply a Riva Tank. It has 4 long threads in it. However, the first one I had leaked REALLY bad and shorted out the battery (Will get to that in a second). The second one just stopped working. Refunds and exchanges are not an option with them so I am stuck with a battery unit and no tank (They didn't receive a shipment and don't know if they will get any more). So, I started looking online. However, I do not know what my battery pack is, I am not sure if I am limited to what they carry. I have 2 starter sets, the Riva Tank that I described and a Slimmer cartridge style one. I believe the smaller to be a 501 because it is about the size of a real cig and has a Blue Led on the bottom tip. The battery that I got with the Tank system is 2.75" tall and 0.5" in diameter with a button that turns blue when pressed. In my research I have seen mention of differing voltages, ohms and that some tanks work better with higher voltages...That is where I get confused. Can someone please try to help this extreme newbie!! I really like the vapor and don't want to go back to regular cigs!!! I just need to understand things so I can buy online and be confident that I am getting things that will work. I have invested a lot of money in the items I have and don't want to order another starter kit to ensure compatibility. Please Help!