mod warm, battery not?

[Minnis12]

I recently started building my own coils and I finally did my first dual coil in my tobh. When I vape on it 3-4 long draws in a row I noticed that my mod gets warm (not hot) and when I check the battery its fine and at normal temperature. I'm using a copper 4nine mod 18650 efest 30 amp. My coils are 0.24 ohms and no shorts that I can tell. Is the mod just getting warm from the heat coming off the Atty? And also with this coil build it seems like it takes my coils longer to cool off than it does my other builds. Is this normal also? (Pic related)

 

[Rickajho]

Have you cleaned all the threaded contact points on the tube mod?

 

[Minnis12]

Yes everything is clean. It's not dangerously warm. It's tolerable. It's just that my other RDA at 0.4 ohms doesn't do this.

 

[Minnis12]

I'm hoping its just heat transferring from the RDA cap to the body of the mod since the coils get hotter on the tobh since they are lower resistance. Is that possible?

 

[dchemist]

I'm hoping its just heat transferring from the RDA cap to the body of the mod since the coils get hotter on the tobh since they are lower resistance. Is that possible?

My nemesis clone gets warm as well. That's when I set it down and go do something.

 

[Minnis12]

So it's just the heart from chain hits?

 

[crxess]

First, the Atty generates Heat. Heat Spreads across Metal.
Second - See the thing your mod is attached to? Hand acts as an insulator and holds heat in.

Later!

 

[Minnis12]

That's the answer I was hoping for! Lol thanks man!

 

[Warpigs]

Yeah I noticed on a buddy of mines mod that it got rather warm, I asked him if it was not working correctly. He told me to get my hand off the top part heh.

 

[k702]

on a fully charged battery, 4.2v

.4 ohms = 44 watts

.24 ohms = 73 watts

close to double the power.

that's part of the reason for your problem at least.

 

[Despraci]

On a 4nine mod the heat transfer is definitely going to be more noticeable then on a device like the nemesis. Also a copper mod conducts heat a lot better then Stainless steel as well. Try spacing your atty just a hair off the top cap. This might help a little bit.

 

[tayone415]

I recently started building my own coils and I finally did my first dual coil in my tobh. When I vape on it 3-4 long draws in a row I noticed that my mod gets warm (not hot) and when I check the battery its fine and at normal temperature. I'm using a copper 4nine mod 18650 efest 30 amp. My coils are 0.24 ohms and no shorts that I can tell. Is the mod just getting warm from the heat coming off the Atty? And also with this coilView attachment 363639View attachment 363640 build it seems like it takes my coils longer to cool off than it does my other builds. Is this normal also? (Pic related)

The 35 amp Efest has been pointed out to be rewrapped 20 amp continious LG batteries you are using 17.5 amps with a .24 ohm build at 4.2 volts. You want be careful of the actual continuous power since your ohm reader can be off 0.02-0.04 ohms and can go bad out of nowhere.

 

[Minnis12]

The 35 amp Efest has been pointed out to be rewrapped 20 amp continious LG batteries you are using 17.5 amps with a .24 ohm build at 4.2 volts. You want be careful of the actual continuous power since your ohm reader can be off 0.02-0.04 ohms and can go bad out of nowhere.

I was not aware of this thank you! I'm using 1 purple e fest and 2 red e fest's.

 

[Bunnykiller]

thats normal for the Tobh and the ohms you are running at ( 70 - 80W and 19A) be sure your battery is rated for 30A

 

[dchemist]

So it's just the heart from chain hits?

That's what I believe.

 

[Susan~S]

The 35 amp Efest has been pointed out to be rewrapped 20 amp continious LG batteries you are using 17.5 amps with a .24 ohm build at 4.2 volts. You want be careful of the actual continuous power since your ohm reader can be off 0.02-0.04 ohms and can go bad out of nowhere.

+1 on this.

If your batteries are the purple Efest 18650 2500mAh 35A batteries -- they are not 35A continuous. They are really rebranded LG18650HE2 2500mAh 20 amp continuous batteries. Source: Battery Basics for Mods: IMR or Protected ICR?

Here is another warning that was posted on ECF regarding another purple Efest battery: Efest 3100mAh battery caution

 

[Rediculous]

As previously stated it is the heat transfer from your atty to the mod. The thinner the walls the faster the transfer, as well as material of the mod. As for the batteries, they are HE2's re wrapped and are 20a continuous rated, what we don't know is what the factory specs are for "continuous" or "peak" since they vary greatly by manufacturer. So efest may be telling the truth by their own standard. My purple efest says "discharge current:30a (60a can last for 75 seconds)". So with this information I can conclude that LGHE2's have been rated by a different standard, maybe they run them for longer periods to determine their amp limits, but I wouldn't push the boundaries since I don't trust any of these companies very much. Your set-up should be completely safe for normal use, I wouldn't recommend running it in a continuous manner just take 2-3 hits and set it down for a few.

 

[Minnis12]

So I did some digging into this and the continuous discharge is what its rated for at long periods of time. The particular battery actually has a MUCH higher PULSE discharge rate, somewhere around 60A, that is actually rated for 75 seconds. So the continuous rate doesn't really matter since we don't vape on a battery by hitting the button once and running it done completely (4.2v-3.6v) which is what the continuous drain is meant to be