Your build res, wire gauge, wire type, coil diameter, coil style, wicking medium, wicking density, wicking style, airflow, juice type and which regulated mod you are using all contribute to how high of a wattage you can vape at. Wattage is the heat produced and is directly proportional to the amount of juice converted to vapor. I'm not asserting that we should "rate" batteries by juice consumption at a given wattage but rather that to more effectively share our battery life experiences with our mods it is necessary to include those two factors in our discussions when talking about battery life.
So again, if someone says they get 2 days out of an 18650 but don't share with us how much juice they vaped at what wattage we gain nothing by the comment. I still stand on my original comment