Mechanical Mod Mayhem?

[Mden89]

So with unrestricted mechanical mods, how does one know how many watts, volts, and amps being applied through ohms law? Is it solely the voltage charge of the battery installed that will determine everything else because of how ohms law works?

 

[Bunnykiller]

yup....

here is a neat Excel sheet to play with for such stuff
Excel Coil Calculator | E-Cigarette Forum

 

[alicewonderland]

yes it is the voltage of the battery. making sure you build a coil that the battery is able to power safely is the next thing. batteries go from 4.2v and drop over use. Then there is voltage drop etc etc, voltage under load etc. Mech mods aren't for new vapers, and you have to make sure you do your research before stepping into the mech mod area. Shorts u need to watch out for, battery safety and management/upkeep. Testing of RDA's (with topcap on) on devices or meters before placing them on your mech mod, gota do all of this stuff because there is no circuitry or boards to keep you safe in there in case of a short circuit/reverse battery and other stuff

 

[WattWick]

It's easier to keep watts entirely out of the picture. Watt is just a measure of the end result and serves no purpose on its own.

A battery will always try to discharge itself as rapidly as possible. The resistance of the coil is what keeps this discharge at a controlled rate. The coil is to a battery what a tap is to a waterline. Except you can't adjust a coil like you can a tap.

 

[alicewonderland]

It's easier to keep watts entirely out of the picture. Watt is just a measure of the end result and serves no purpose on its own.

A battery will always try to discharge itself as rapidly as possible. The resistance of the coil is what keeps this discharge at a controlled rate. The coil is to a battery what a tap is to a waterline. Except you can't adjust a coil like you can a tap.

well , in the vaping sense. The coil is what you adjust, but not by actually 'adjusting it' (the 1 coil), you do it by putting in a different coil (different resistance will let the battery discharge more or less based on the resistance of the coil).

the only thing you are in control of in ohms law is the resistance (coil).

 

[Mden89]

Yeah i dont plan on going into this realm any time soon, but i want to start educating myself so down the road when i do take the step into the unrestricted realm of mech mods i am ready.

@WattWick I know what you mean and thats whats kind of confused me up until this point. I hear alot of people say volts dont mean much next to watts. But after learning the ohms law i can see its very important.

@alicewonderland my question to you now is at what point do you know to charge the battery on these mech mods if theres no circuitry to identify the charge and so on. I know how to calculate my amp/watt output based on voltage and resistance. But the one thing that scares me on these mech mods is the uncertainty of battery life.

 

[alicewonderland]

Yeah i dont plan on going into this realm any time soon, but i want to start educating myself so down the road when i do take the step into the unrestricted realm of mech mods i am ready.

@WattWick I know what you mean and thats whats kind of confused me up until this point. I hear alot of people say volts dont mean much next to watts. But after learning the ohms law i can see its very important.

@alicewonderland my question to you now is at what point do you know to charge the battery on these mech mods if theres no circuitry to identify the charge and so on. I know how to calculate my amp/watt output based on voltage and resistance. But the one thing that scares me on these mech mods is the uncertainty of battery life.

for me, I charge then when I start noticing a steep drop in performance, which is usually around 3.3-3.5V. You will definitely notice that its not hitting like it did at 3.7-4.2v.

a 0.3 coil
at 4.2v = 58.8watts
at 3.7v = 45.63watts
at 3.3v = 36.3watts

freshly charged it will perform very well then taper off to 3.7 for most of the battery life. once it drops below is when you really notice at least for the resistances I build my coils at. a ~20watt different in power from 3.7v to 3.3v is easily noticeable.

the main thing is they say dont discharge it below 2.5v, but usually even when you get near that, the current being pushed through your coil is so weak that your battery basically feels dead.

 

[Mden89]

So let me use a random scenario as an example. Say im running a mech mod with my 18650 battery in it at full charge (4.2V). I have a dual coil setup on my dripper with 26ga kan. Each coil is 1ohm so together they fire at .5 ohms. This pumps out ~35 watts and will stress just under 9amps on the battery. I know the battery has a CDR of 20-25amps so im nowhere near the "danger zone". However, if my battery drops down to 60% battery we are looking at much more amp stress on the battery and thats what i worry about. Do you just charge them every night to be safe or do you have a tester to make sure they arent getting too low?

 

[WattWick]

well , in the vaping sense. The coil is what you adjust, but not by actually 'adjusting it' (the 1 coil), you do it by putting in a different coil (different resistance will let the battery discharge more or less based on the resistance of the coil).

the only thing you are in control of in ohms law is the resistance (coil).

Hehe! I'm sure I could have phrased that better. Did try! Yes you can adjust by swapping coils. But you can't adjust by mere adjusting. That's what I should have said.

 

[Mden89]

for me, I charge then when I start noticing a steep drop in performance, which is usually around 3.3-3.5V. You will definitely notice that its not hitting like it did at 3.7-4.2v.

a 0.3 coil
at 4.2v = 58.8watts
at 3.7v = 45.63watts
at 3.3v = 36.3watts

freshly charged it will perform very well then taper off to 3.7 for most of the battery life. once it drops below is when you really notice at least for the resistances I build my coils at. a ~20watt different in power from 3.7v to 3.3v is easily noticeable.

Ahhhh i think what im not realizing here is that this is a mod with no electronics in it whatsoever. So it wont try to adjust the amps to compensate for the voltage i want to put out. It will just continuously discharge at the fastest rate until the performance decreases. So the amp stress wont really go up as the volts drop because the mod isnt trying to keep the voltage at a certain rate.. they will go down in fact

 

[Mden89]

So i guess the only real danger with these unrestricted mods is when you try to push them to their max with super low resistances and ultra powerful batteries

 

[alicewonderland]

So let me use a random scenario as an example. Say im running a mech mod with my 18650 battery in it at full charge (4.2V). I have a dual coil setup on my dripper with 26ga kan. Each coil is 1ohm so together they fire at .5 ohms. This pumps out ~35 watts and will stress just under 9amps on the battery. I know the battery has a CDR of 20-25amps so im nowhere near the "danger zone". However, if my battery drops down to 60% battery we are looking at much more amp stress on the battery and thats what i worry about. Do you just charge them every night to be safe or do you have a tester to make sure they arent getting too low?

the stress on the battery actually drops over time, because the voltage drops.

V=IR

v= volts
I= current (amps)
r= resistance

vapecalc.com for easy calculations.

basically, the resistance is a constant, as the voltage of the battery drops, the current also drops, so it is actually less stress in the battery over time. The most stress on the battery is when its fully charged,

 

[Mden89]

the stress on the battery actually drops over time, because the voltage drops.

V=IR

v= volts
I= current (amps)
r= resistance

vapecalc.com for easy calculations.

basically, the resistance is a constant, as the voltage of the battery drops, the current also drops, so it is actually less stress in the battery over time. The most stress on the battery is when its fully charged,

Exactly. I sort of had that "oh DUH" moment as you were typing this

 

[alicewonderland]

So i guess the only real danger with these unrestricted mods is when you try to push them to their max with super low resistances and ultra powerful batteries

well, there are more dangers. Like battery arcing in bad mech mods, or short circuits in bad mech mods or unkempt batteries (torn wrapper on batteries - metal touching the battery itself other than on the positive and negative contacts) those are whats dangerous about mech mods. Pushing the mech mods to its limit without going over what the battery can handle is one thing, but checking off the lists of potentially higher danger is where the real danger is. Like making sure you have tested that RDA with the topcap on so it doesnt short the battery when u put it on a mech, because the coil is touching the outer barrel of the RDA = short. A torn battery wrapper where the casing directly touches the tube of the mech mod = short, arcing battery = carbon buildup on mod and battery damage.

You really just have to be careful with all aspects of it. Responsible is the main word that comes to mind, I wouldnt trust mech mods with everybody. The regulated mods though take care of all of that for most people.

 

[Mden89]

well, there are more dangers. Like battery arcing in bad mech mods, or short circuits in bad mech mods or unkempt batteries (torn wrapper on batteries - metal touching the battery itself other than on the positive and negative contacts) those are whats dangerous about mech mods. Pushing the mech mods to its limit without going over what the battery can handle is one thing, but checking off the lists of potentially higher danger is where the real danger is. Like making sure you have tested that RDA with the topcap on so it doesnt short the battery when u put it on a mech, because the coil is touching the outer barrel of the RDA = short. A torn battery wrapper where the casing directly touches the tube of the mech mod = short, arcing battery = carbon buildup on mod and battery damage.

These seem like really simple safety precautions though. Also seem like a bit of common sense. You dont want to bridge the connection anywhere other than where its supposed to on the terminals.

 

[alicewonderland]

These seem like really simple safety precautions though. Also seem like a bit of common sense. You dont want to bridge the connection anywhere other than where its supposed to on the terminals.

yeah common sense to some, though usually there are people who these kind of things never cross their mind, or are uneducated in the area. There are a lot of vapers out there who dont know the inner workings of how a simple circuit works, let alone a mech mod or regulated mod.

 

[Mden89]

yeah common sense to some, though usually there are people who these kind of things never cross their mind, or are uneducated in the area.

Yeah i can see where someone would approach this like a kid in a playground

 

[JUDGMENT AFFIRMED]

It's easier to keep watts entirely out of the picture. Watt is just a measure of the end result and serves no purpose on its own.

A battery will always try to discharge itself as rapidly as possible. The resistance of the coil is what keeps this discharge at a controlled rate. The coil is to a battery what a tap is to a waterline. Except you can't adjust a coil like you can a tap.

What's watts? I agree with WattWick. Almost 3 yrs for me and not once did I bother to figure "watts".

 

[JUDGMENT AFFIRMED]

These seem like really simple safety precautions though. Also seem like a bit of common sense. You dont want to bridge the connection anywhere other than where its supposed to on the terminals.

The reason magnets can be dangerous if they slip out of position.

 

[Thespis]