9 to 12 watts for atty

[mcquinn]

For those of you who are striving to build your own atty's it appears that the ones we use every day are in the 9 to 12 watt range.

[Shadow Vaper]

Seems this post has been here for a while.

Though I am sure these have been posted elsewhere here on the forum, here are a few formulas to use.

Amperage equals voltage divided by resistance
A standard e-cig battery is rated at 3.7 volts. A popular atomizer, the Joye 510 typically measures 2.2 ohms.
3.7 volts divided by 2.2 ohms equals 1.68 amps

Wattage equals Amps times volts.
1.68 amps times 3.7 volts equals 6.2 watts.

A 5 volt mod would produce 8.4 watts with the same Joye 510 atomizer. 6 volts would produce 10.08 watts.

A low resistant 1.5 ohm atomizer will produce 2.47 amps on 3.7 volts or 9.13 watts.

A fully charged 3.7 volt battery will in most cases actually output up to 4.2 volts on initial loads. This will boost them at first up to 8.08 watts on the 2.2 ohm Joye 510 , while a low resistant 1.5 ohm atty will produce 11.76 watts.

As the intial surface charge on these batteries drop so does the performance.

There are some mods available these days that regulate the output to keep up with a desired performance level. Such as the Provari or the lavatube which are variable voltage mods, or the Darwin which is a variable wattage mod. Of the two, IMHO the variable wattage mod offers better control as it takes in to consideration the resistance of the atomizer to provide the desired output.
I hear that the makers of the Darwin are in the process of making a drop in Darwin like device called the Kick, that can be used in other big battery mods.

[mcquinn]

I erred on the high side it would appear.While those formulas will give you a good guess,protected lithium ion batteries limit the current so as not to discharge them too fast and cause a sudden relese of energy.So to find out what you are actually getting and not theoreticly getting you would have to measure current under load.One way around the current limiters is putting batteries in parallel ,that is about the only way other than a direct passthrough to get it all.I personally don't worry about it too much,as long as I get the goods I am a happy camper.