You can kick a REO. If you wrap your own coils, though, I think you'll find you don't need to. There is some voltage drop, and Rob is putting together a sub-ohm kit right now. An AW IMR 18650 battery will last me for at least 3 or 4 ml of juice. It all depends on your vaping style and how much you vape, but it'll last me several hours. It's really subjective and based on lots of variables. If I'm going to be out and about all day, I'll either carry a spare battery -- or a spare REO.....