Just to give you an idea of the "battery soak" that VV/VW mods 'take away' from a battery, this is from the instructions for the Kick by Evolv:
"7.) Battery life per charge: Many variables contribute to battery life per charge cycle. The Kick incorporates a boost circuit which requires more of your battery. Aggregate button/activation time, power setting, and atty/carto selection all factor into this equation. Battery age and conductive efficiency of the different devices are also variables. Using the Kick will reduce battery life per charge cycle. There is no way to provide use time per charge cycle as there are too many variables. On average, testers experienced reductions ranging from 10 to 20% depending on many different use variables."
I've never seen Provape or any of the other 'big' VV/VW manufacturers admit that battery life is reduced in a mod using any type of boost circuit (present in any mod has any setting over 3.7V with a single 3.7V battery). Buck circuit used in stacked battery mods are a different story, but most VV/VW single-battery mods are going to see a 10-20% battery charge-life reduction.
A huge number of factor weigh in though, and as Dontae said using SLR coils will quickly deplete smaller batteries that may run for quite a while at lower voltage/wattage.
