T = Tank, W = .....I have no clue what it means, and I have one, but it's the clearomizer described earlier, and C = a rebuildable atomizer. The batteries are all the same type, but if you buy the T kit, or W kit, or C kit, you get the parts above with it. That's really the only difference. I personally haven't ever bought a kit. I just bought the piece parts myself and made my own kit

My 900 mah regular-nothing-fancy-or-special batteries with a charger and a box of boge cartos are what broke me from smoking permanently. My 801 kit (Ok, I guess I bought one) didn't break the habit cause it was really more of a toy than a e-cig, as it wasn't dependable. So the acronyms don't mean a whole lot when it comes to batteries, just the the things that go on top. Once you get the concept of atomizer/cartridge, clearomizer, cartomizer, and tank for the toppers, and the different thread types available, the rest is easy
