Unfortunately the 100mAh per hour was coined back when 3.7v 3.2Ω devices were the norm. It is not the gasoline that determine how many miles per gallon you get, it's the car. Consider the basic battery and higher Ω coil as a fuel efficient car, then consider what many devices are currently on the market. They are more like full size SUVs and even formula race cars.
Sound off if you remember when you went from an 3.7v mod with high Ω coil to a 2Ω coil, or especially jumping to an RBA/RDA. Do you remember suddenly going twice, three times as much juice?
Bottom line, current draw from your battery determines how long the battery will last, there is no set standard unless you quantify and remove the variables. Another factor to consider is the same identical set up vaped by a casual puffer vs a chain vaping madman.
A subΩ RBA with drilled out air and wick holes pushing 25 watts can fit the 100mAh per hour with a modest puffer, and a 3.7v 4Ω modest setup in the lips of one who breaths through it non stop with use more...
But you still want to be able to speak wisdom and truth to new customers without requiring them to listen to and understand a thesis? Tell them that with "X" basic set up the battery "can" last xmaH/hour, that both lower resistance attys and more frequent vaping uses up the battery faster. So your 100mA per hour figure really depends on them.
In this way, they are given the facts, can't complain that you told them it would last X hours but didn't, and also have a beginning understanding of the variables associated. If their battery goes prematurely, they won't automatically think they were lied to, they may instead consider their vaping frequency, or that new 1.8Ω carto they are trying as the culprit.
