Awareness of Ohm’s Law is arguably the most important part of safely using a mechanical mod and RBAs. Ohm’s Law looks at the relationship between power, voltage, current, and resistance. It’s based around the amp of the battery – this amp rating is the current of the battery, in other words the ability of the battery to release the energy stored within it. If the battery is pushed beyond its limit, the battery can vent, which means dangerous chemicals leak from the battery, with a risk of it exploding.​

Firstly, check the resistance of your coil and work out the amps the coil will pull from the battery. You can do this by using this equation: Amps = Voltage ÷ Resistance. Don’t be put off, it’s quite simple. Use a multimeter to find out the voltage of your battery, and the resistance of your coil (be sure to work within a ±0.2 ohm range. The result should never exceed the amp rating of your battery. If it does, you’ll have to use a coil with a higher resistance.


Failing to follow this advice and using a mechanical mod at a level that exceeds the battery’s upper amp limit is known as short circuiting the battery. It has the potential to burn out your battery, damage the mod and even explode. If you accidentally do this your batteries are dangerous and must be disposed of safely. Sub ohm vaping on a mechanical mod takes your device close to short circuiting, but keeps the resistance of the coil is just under the upper amp limit. Consequently, you should take extra care if sub ohm vaping on a mechanical mod.

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