Based on the discussion in this thread, it occurred to me that I may have inadvertently been doing something dangerous. Regulated mods draw lower current from the battery when the battery voltage is higher and higher current when the voltage is lower. So when a battery is fully charged at 4.2v, the mod would draw less current from the battery than it would if the battery was close to discharged at say 3.4v. The danger, in my opinion, comes in where a person may have a build, especially on a single battery mod, that draws close to the maximum current that the battery can manage safely. You may be safe when your battery is fully charged, as the current draw is lower, but as the battery gets discharged and the voltage drops, the mod would draw a higher current, and could possibly exceed the battery's rated CDR. At the very least, this could lead to the battery being damaged so that it doesn't last as long as it should in terms of charge/discharge cycles. This should not be a concern with unregulated mods as the power drops along with the voltage and so the current draw remains the same depending on the build you have in your atomiser.