The primary issue with unregulated mechanical mods, when compared to a regulated electronic mod, is there is no protection circuity to help keep one out of harm's way. As an example, an unintentional continued compression of the fire button while in a pocket or purse can cause a rapid over-discharge of the battery and cause the battery to vent or explode, and in return cause an unvented metal mod to explode like a pipe bomb.
A regulated mod will have, within its protection circuitry, a timed auto-cutoff of the fire button preventing the above. Now, none of us should become so over-confident in this safety feature that we forget to turn off our mods when in a pocket or purse because electronics CAN fail from time to time; but having that feature has probably saved many of us a lot of grief.
With an unprotected mechanical mod, your only safety circuitry is between your ears and an awareness to details. There is no safety chip to help keep you from harm's way.
So with no safety features in a mechanical mod, one must be ever aware of what could cause a battery to hard short.
batteries are extremely powerful and when they are abused/misused they tend to get extremely angry. So a mech user must be extremely knowledgeable about not abusing/misusing their batteries.
They need to use the best batteries available (by Lg, Samsung, Sony, and Sanyo), avoid counterfeits by purchasing their batteries from known reputable suppliers, and know the true amp rating (
continuous discharge rate) of the battery.
They need to know how many amps (known as the "amp draw) their coil will pull from their battery. This is the "Ohm's Law thing". You don't need to do any math or chemistry equations, just learn to use a calculator..You can easily calculate the amp draw of your coil by using a simple
online Ohm's Law calculator.
You type in two known values (for example the measured coil resistance and the voltage of a fully charged battery of 4.2 volts), click calculate, and the value number in the amps (current) window will reveal the amp draw. The amp draw must not be a larger number than the amp limit of the battery or things can go sideways rather quickly. That is battery abuse/misuse.
Please make sure that you understand the below blogs before deciding to get a mechanical mod. Everything you must know is there. If there is ANYTHING that you don't understand, ask someone here to help you understand it. There are no stupid questions where safety is concerned.
A Beginner's Guide to Your First Mechanical Mod
Explain it to the Dumb Noob: Ohm's Law Calculations
Battery Basics for Mods: The Definative Battery Guide for Vaping