Ohms Law

Ohms law is not that complicated, we always know at least two of the variables, so it becomes easy to calculate the remaining two.

V = I x R (V=voltage, I = current (in amps), R=resistance (ohms))

P = I x V (P=Power (watts))

I = V/R

The Voltage never changes from 4.2v unless you are using a stacked tube or series mech, in which case you simply multiply 4.2 by the number of batteries you have in your device.

Equations can be off putting so:

If you want to know what amps you’ll be pulling from the battery when you fire it: 4.2 / Coil resistance. For example, 4.2 / 0.22 = 19 amps (This applies to single battery tube mods and parallel mods). This is very important as it helps to identify whether your build will be within the range of your batteries continuous discharge rate (CDR) when you fire it.

For power multiply your amps from the previous calculation by 4.2. So it’s 4.2 x 19 = 80.18w. Therefore a single cell mech running a 0.22ohm build would pull 19 amps from the battery and be vaping at 80.18 watts.

Some examples are given below:

Resistance (Ohms)
Power (Watts)Current (Amps)


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Shortfill E-liquid & Nic Shots

Shortfill e-liquid refers to larger bottles of liquid in 0mg nicotine strength, including 100ml & 250ml bottles that are only filled to 80% capacity, hence short fill. The remaining space allows you to add a nicotine shot/s to create a liquid to your desired nicotine strength as below (or none if you want zero nicotine liquid):

E-liquid (ml)Strength of 10ml Nic Shot (mg/ml)Nicotine ShotsFinal Result
801511.6mg in 90ml
801812mg in 90ml
801523mg in 100ml
801823.6mg in 100ml

Bottle ready for nicotine shot adding

Remove nib to add nicotine

Add nicotine to bottle

It’s worth mentioning that many nic shots are VG based which is quite thick and in cold weather it get’s thicker. I just sit them in a box on the radiator or in a cup with a bit of hot water in for a while to make the VG become runnier and easy to use.

After you’ve added the required nic shot, replace the nib and cap and shake vigorously to mix it together.

Additionally most eliquid comes in chubby bottles with a thin nib like above. This can make the higher VG liquids harder to squeeze out. I’ve found that cutting the nib down makes it a lot easier to squeeze the bottle to make liquid come out at a reasonable rate, as shown below.