It's been a long time since I've bought a box. I'm so lost. Currently I'm using MVP4. Before that I used a Cuboid, but the 510 connection on those kept going bad. Before that I used a Provari and various other things. I usually vape about 25 Watts on a 0.6 resistance coil. I make my own coils and juice. Coils are single clapton wire in a tank. I'm satisfied with my coils and tank. I don't really need something that goes to super high watts, but I do like my batteries to last a long time. The MVP4 has an internal battery. I'm not opposed to going for something with 18650s, but I don't know which ones to get anymore. All my old ones are probably too old, so I should buy new. Oh, edited to add that I prefer 2 batteries rather than one because I like how they last longer. Y'all point me in the right direction. I was looking at the VooPoo drag or Wismec something. TIA!