How's everyone doin'? My name is Brian, from NE Philadelphia. Been vapin' for a while now, (about a year) but not being an electrician, (I'm a Boilermaker) I'm a little confused about the battery matchup stuff. I use a KR808D1 from Myvaporstore.com at the moment but I want to upgrade to a better system. I've been looking at the tank systems on vapor4life.com (the 3.5 ml) model. It says it fits the KR808D (which I'm not sure is the same as the D1) and I want to stick with the same thread design I have. I want to get the dual coil model tank carts and don't know if the titan battery will work with my regular carts I already have. (The normal KR808D1 from MVS.com) I don't always want to use the tank. I want to use regular carts also as they sometimes are more convenient for whatever reason. I also just want to know what batteries and carts to buy if and when I want to upgrade to an ego a mod. I want to know what matches what as far as batteries and carts ohm/volts/mah wise. Thanks --Brian