Didnt plan on it but i have a mech mod now. Dont wanna be a statistic in the news so i want to ask questions. Ohms law, as i understand it is i=v/r. So therefore, the only battery i have for it right now is an ijoy 20700, with what im assuming is exagerated specs, like 40amp. Using this anyway, i built a dual coil twisted clapton thingy and the resistance is .10. Now i dont believe the battery really is really a 40 amp but if it actually is, .10 ohm is really close to the danger zone. If this 40 amp spec is wrong, .10 will be disastrous . Probably the best thing i can do is rebuild my coils and get the resistance up a little bit higher. Ill look thru the battery threads but i dont think this 20700 is really 40 amp. Any thoughts?
- Status
At best, that is a 20A battery. It’s not a very good performer for a mech either.
The first thing to commit to is the knowledge that a lithium cell contains magnitudes more power than the carbon zinc and alkaline formulations we've used all our lives. A short followed by a chemical reaction from overheating on a lithium cell usually can't be stopped once it's started. For that reason, a regulated mod is the safest way to vape. If you must use a mech, educate yourself, watch the videos of lithium cells that have shorted, and realize that you are holding a potential fire bomb in your hand if you exceed the max current range of the cell.
A regulated mod will vape just as well and maybe vape better than a mech since it self regulates the output as battery voltage drops. A mech will always lose power and vape quality over time as the battery voltage declines. The best features with regulated mods are short and over current protection in addition to a stable vape throughout the charge cycle.
Other than that, learn all you can about lithium cells, be safe, and enjoy the vape.
A regulated mod will vape just as well and maybe vape better than a mech since it self regulates the output as battery voltage drops. A mech will always lose power and vape quality over time as the battery voltage declines. The best features with regulated mods are short and over current protection in addition to a stable vape throughout the charge cycle.
Other than that, learn all you can about lithium cells, be safe, and enjoy the vape.
Last edited:
I kinda thought so. At 20 amp maybe, my .10 ohm build will light up the night sky. I dont think i want to be on the news that bad. Ive got an adapter sleeve to use one of my samsungs in but even this battery is 20 amp. So i reckon ill just rebuild my coils to beef up the resistance. Not using this mech til i get everything dialed in safe. I had to take it away from my roommate before he blew himself up. He has absolutely no idea what he's doing, let alone how to calculate the numbers for safety's sake. Thanks @Mooch for the reply.
I prefer regulated mods. Never planned on having a mech. My roommate is not the sharpest knife in the drawer and i figured he was gonna light hisself up eventually with it. Finally convinced him of this.
Give him some info on lithium batteries and encourage him to study it. The worst thing a new mech user can do is walk blindly into unsafe territory thinking, "it's just a battery. What can go wrong?". The answer is everything if you don't respect the power of a lithium cell and choose the right cell wisely.
YouTube has many videos that show what happens when a lithium cell shorts. They will make him a believer. Seeing is believing. Then, you think about what might happen if that cell was in your pocket when it began to spew hot electrolyte.
Last edited:
I know this and you know this, but my roommate is kind of a dumbass to begin with. Ill try to instuct him, but if he wants to vape ill point him towards a good reg mod.
It's kind of like people who want a 4 or 5 speed stick shift in their first car. After a year of changing gears they decide an automatic really was the best choice, as their friends suggested.
You and your room mate need to learn that there are two things to know about sub-ohm vaping with a mech mod. And learning these two things is critical, or neither of you has any business using a mech mod.
There is no 18650, 20700, 21700 battery that has 42 amps of power, so one would need a build of at least 0.21 ohm to use a 20 amp battery, 0.14 ohm for a true 30 amp battery. These figures are from using an Ohm's Law calculator. The lower the resistance of the coil, the higher the amp draw the coil has, the more amps are required to fire the coil.
Explain it to the Dumb Noob: Ohm's Law Calculations for a Mechanical Mod
A Beginner's Guide to Your First Mechanical Mod
- The coil(s) you use will have an "amp draw" based upon the ohm rating, or resistance measurement.
- All batteries have an "amp rating", or continuous discharge rating. The amp draw of the coil must never exceed the battery's amp rating.
There is no 18650, 20700, 21700 battery that has 42 amps of power, so one would need a build of at least 0.21 ohm to use a 20 amp battery, 0.14 ohm for a true 30 amp battery. These figures are from using an Ohm's Law calculator. The lower the resistance of the coil, the higher the amp draw the coil has, the more amps are required to fire the coil.
Explain it to the Dumb Noob: Ohm's Law Calculations for a Mechanical Mod
A Beginner's Guide to Your First Mechanical Mod
Last edited:
Truth is, if you want a 0.1 ohm giant dual coil build to blow big clouds that'll show up on NEXRAD, get a regulated 2 or 3 battery box. It's simply way more power than you'll get out of a mech, short of some exotic 4 cell dual parallel series mech. Mechs were the thing when regulated mods offered 20W at best. These days there's simply no need.
That said, I love my mech squonk mods for their simplicity and no squonk mess worries. But I use those little 22 mm single coil rdas with builds between 0.5 to maybe 0.3 ohm at the lowest. Match your hardware to your use, and always remain within the bounds of what you select. If you can't build something simple with a rational resistance for a mech "you have to use", you're looking at possibly some very expensive medical bills in addition to whatever property you set on fire.
That said, I love my mech squonk mods for their simplicity and no squonk mess worries. But I use those little 22 mm single coil rdas with builds between 0.5 to maybe 0.3 ohm at the lowest. Match your hardware to your use, and always remain within the bounds of what you select. If you can't build something simple with a rational resistance for a mech "you have to use", you're looking at possibly some very expensive medical bills in addition to whatever property you set on fire.
Yeah i already figured 3.7v divided by .10 ohms is 37amps and if the battery was really 40amp, 37 is real close to scary. i will have to beef up my coil build. I got no problem with figuring the math. I also highly suspected that the battery i have isnt really 40 amp. @Mooch said it was probably closer to 20amp. I got a pretty good handle on what im doing though. Ill pull those coils an use them on my drag and dead rabbit. Ive got enough wire to work with to make more coils. This ol coyote aint gonna be on the news. Im not even gonna use this mech until i get my coils at a proper resistance for a 20amp battery. I wanted confirmation, i guess, of what i already knew and i certainly appreciate the feedback from everyone. And to know you guys got my back on this is awesome too. Much thanks.
Im good. I got this. I dont have to use a mech, but im glad my friend saw the light before he lit hisself up. Ill dial it in proper before i do use it, no worries. I do understand and appreciate the concern though.
Echoing Baditude's comment, If you do the math you'll see that moving from a .1 ohm coil to a .2 ohm coil will halve the current draw from 37 amps to 18.5 amps. Still pushing the cell you use close to the limit, but there's probably a sweet spot you can vape in that will satisfy your vape taste and preserve your safety.
Ohms Law Calculator
I use both. Mechs all day, and reg in bed as I can’t be trusted to stay awake lol...
the pressing concern is obviously safety, but I’ve never driven an automatic and it’s interesting that you think auto is the best choice. May I ask why you think that? Manuals are so common here and I’ve never thought about an automatic.
Last edited:
Well, i rebuilt the coil setup. .24ohms. 20amp battery. Gives me almost 5amp leeway for safety. It works. How does it vape, you might ask? Impressed i am not. Nor did i expect to be. If i could get me a real good 30amp battery, might be a different story. So my curiosity and the need to not let a machine beat me is satisfied. Ill keep it around for occasional use. I knew this going in, and realize im not missing anything. I do get a far better vape from my tfv12 king and voopoo drag and i can push the tfv12 .15ohm coil to 135watts comfortably. But i enjoyed the learning experience and will continue to tinker.
If you want a hot super cloudy vape, then stick with your regulated mod and your TFV12.
You will not be able to achieve the same experience with a single battery mech, because physics, and current battery technology.
The process for picking a coil and battery for a mech is pretty straight forward.
1. Choose a (realistic) power level
2. Use ohms law and/or steam-engine to choose a coil/s that provides this wattage
3. Calculate what amp draw this will generate.
4. Pick a battery that of a known and proven CDR (continuous discharge rate) that matches this amp draw, with some safety headroom.
A fully charged 18650 will be at 4.2 volts
If you use two coils then the total resistance will be halved, ie. two 0.5 ohm coils will result in a total resistance of 0.25 ohms.
0.25 ohms at 4.2 volts is 70 watts and will draw 17 amps.
The Samsung 30Q or the LG HG2 would both be great choices for this particular setup.
Remember that this is theoretical. In a real world example you will be lucky to get 60 percent of that wattage due to the inherent losses in unregulated systems and battery sag. So you would be looking at about 50ish watts to your atomizer. Also as with all unregulated devices, that 4.2 volts will quickly drop off to under 4 volts and will continue to decrease along with the output wattage as you vape.
Also
, using claptons or similar high mass coils will compound your problems as the large amount of wire involved will need even more power to bring up to temperature than a simple round wire coil.
You will not be able to achieve the same experience with a single battery mech, because physics, and current battery technology.
The process for picking a coil and battery for a mech is pretty straight forward.
1. Choose a (realistic) power level
2. Use ohms law and/or steam-engine to choose a coil/s that provides this wattage
3. Calculate what amp draw this will generate.
4. Pick a battery that of a known and proven CDR (continuous discharge rate) that matches this amp draw, with some safety headroom.
A fully charged 18650 will be at 4.2 volts
If you use two coils then the total resistance will be halved, ie. two 0.5 ohm coils will result in a total resistance of 0.25 ohms.
0.25 ohms at 4.2 volts is 70 watts and will draw 17 amps.
The Samsung 30Q or the LG HG2 would both be great choices for this particular setup.
Remember that this is theoretical. In a real world example you will be lucky to get 60 percent of that wattage due to the inherent losses in unregulated systems and battery sag. So you would be looking at about 50ish watts to your atomizer. Also as with all unregulated devices, that 4.2 volts will quickly drop off to under 4 volts and will continue to decrease along with the output wattage as you vape.
Also
, using claptons or similar high mass coils will compound your problems as the large amount of wire involved will need even more power to bring up to temperature than a simple round wire coil.
I run single battery mechs squonks exclusively (have yet to find a regulated mod that works for me) and I can say it can be very tricky to find a build that does the trick if you are looking for something particular. But if you put forth the effort, most of the time you can eventually find something that works. Sometimes it requires trying different coil builds on your current atomizers, but with mechs specifically, you may need to find new toppers to get you there since they are a lot less adjustable than a regulated mod.
For single battery mechs, I stick with single coils. They are generally easier for an individual battery to heat up quickly, and tend to help preserve battery life. I run 28x3/40 ni80 fused claptons at around 0.25-0.3 ohms (depending on the device). They heat up instantly and give a nice warm vape, and drain my battery about the same as a similar round wire build. Single battery mechs just seem to work better with higher gauge wire (especially exotic coils).
For single battery mechs, I stick with single coils. They are generally easier for an individual battery to heat up quickly, and tend to help preserve battery life. I run 28x3/40 ni80 fused claptons at around 0.25-0.3 ohms (depending on the device). They heat up instantly and give a nice warm vape, and drain my battery about the same as a similar round wire build. Single battery mechs just seem to work better with higher gauge wire (especially exotic coils).
- Status
Similar threads
