mechanical modes do not explode and never have exploded. All that you saw in news was fireworks because of incorrect batteries. But each and all incident were the misuse failure of electronic cigarettes. I will repeat it ones again: if you do not fully understand the principles of the operation of mechanical mods, please, do not start to use them.
The mechanical mod works on the resistance of your atomizer. So the only thing, that you can adjust, (as by classical mechanics) is resistance
. Mechanical modes do not like short circuit, that is why it is very important to service your atomizer correctly. The coils should be tightly clamped with posts and installed filigree on center. Any short-circuit on the atomizer will interfere with correct operation of your device. In addition, you must choose correctly a battery for your mod and for your build. Mechanical modes allow for use only high-current batteries. The battery amperage should approach the coils resistance.
Mechanical modes for more than one battery can also differentiate by type of connection. There are only two connection types: parallel and series. Parallel connection
is when the voltage of your batteries is not added up. Let us assume, you have two batteries that are powered by 3,7 volts. By parallel connection, the voltage will remain the same, regardless of the number of batteries. In this case, the battery capacity will decrease in turn. In the case of a series connection
, the voltage of your battery will be added up. That is, in a device with two batteries you will get 7,4 Volts on your atomizer. It's a lot. Аor this reason builds working on parallel and series connection differ significantly in resistance.
As I mentioned before, there are several basic form factors of mechanical modes.