How to determine what resistance (ohms) for what battery.
The Chart linked below shows volts, watts and Ohms and how they relate to your atomizer/clearomizer. These figues are for single coil device use only. If you are using dual coils or subohms, please research further and do not use this chart.
Let's take an example. You have an eGo battery and you are wondering what resistance you should get for a clearomizer or if it will work.
In the chart you will see values highlighted in yellow which I call the sweet spot. This is my personal sweet spot, yours may vary. You'll also see a range of values in the RED, which indicated the Danger Zone, the point at which an Atomizer or clearomizer is likely to pop or die.
The chart is setup like so:
The Top row shows voltage from your battery.
The first vertical line shows the resistance of the cartomizer
Draw a line with your finger to match the ohms with the volts and you'll have your watts which is what we will be focusing on below.
Wattage is essentially “heat” and this is what we take into consideration when highlighting certain areas of the chart in red and yellow.
So how does it work? Lets use an unregulated eGo battery as an example.
The battery has an output generally between 3.7 and 4.2 volts and the lets assume the coil is 3.0ohm. Looking this up on the chart we see that this combo will range between 4.56 watts – 5.88 watts, well within the “safe” zone. So your eGo with the same volts should product the same safe result and you can vape like a fiend without too much trouble.
Should you put a low resistant atomizer/clearomizer on your eGo? Yes, but you will see the wattage increase quite a bit. Low resistance cartos are one of the more popular cartos around and it's 1.8ohm and is regularly used on an eGo battery, so while it does seem a little higher in wattage it will still work fine. Please take this chart more as a guide rather than a concrete yes or no.
I have limited my sweet spot to 4 to 7 watts, just because I am wimpy when it comes to electronic devices and I happen to like the output, but you can use anything that's not in the red area (12 watts or more). You could easily go up to 10+ watts or perhaps a bit more if you not a serious chain vaper.
Please note: this chart isn't the end all be all, my “safe zone” and “sweet spot” are not exact and open to interpretation. The danger zone, however, is not. You can easily pop and atty with too much heat. Stay out of the red! Remember this chart is for single coils only, not for homemade coils, subohms or dual coils!
Download the Chart here
If you are using dual coils or subohms, please research further and do not use the chart.
Here is a very simplified table please consult the chart, this is for a quick look
|Battery/Voltage||Single Coil||Dual Coil|
|510, 901, 808||2.0 - 2.5 ohm||NO!|
|eGo Batteries||2.0 - 2.5 ohms.||1.5-1.7 ohms|
|3.7v (Go-go, Larger eGo, Riva)||1.7 to 3.2 ohms||1.5-1.7 ohms|
|5v (Variable Voltage)||2.5 to 3.2 ohms||2 ohms|
|6v (Variable Voltage)||3.2 ohms and up||2.5 ohms|
|7v (Variable Voltage)||4.5 to 5 ohms||3 ohms|
Lower than 1.5ohms and Subohms (under 1.0ohms) are not covered due to their unsafe nature in the hands of a novice and the danger they pose to the battery and user. Dual coils are only covered briefly as a reference in the quick look chart only, always check your numbers.