is 0.10 ohms dangerous?

[crxess]

OK. Looking at the spec of the SX350J.
When using a single 18650

Minimum battery voltage is 3.2V
Maximum output is 60W
Efficiency is 93%

(60/3.2)/0.93 gives a maximum current draw of 20.16A that is right on the line for a 20A cell.

I would not run this close to the edge myself.

The mod can't tell if you have a 5, 10 or 20A cell. It's going to cut the power when the battery dips to 3.2V but at that point it would still be drawing way to much current for the 5 or 10 A cells. How much damage is being done to the cell before the cut off point? How many times will the cell put with the being over stretched? I don't know and I don't want to find out the hard way.

I will not run any mod without some form of protection against an out right short. I won't run any mod at higher wattage levels without a safety margin, to allow for battery capacity degrading over time.

I really don't think a regulated mod is always safe. The level of protection is dependent on each individual manufacturer and can vary from device to device. Users need to check the spec of the mod and the spec of the battery and the likely current levels drawn before hitting the button....

I never advocated Stupidity on the part of a person.
I am simply clarifying the FACT that an electronic monitoring system always monitors. Careless Vapers do NOT.

No one should use a Mechanical or Regulated mod, or even consider customized Vaping until they have educated themselves.

They still make Cig-a-likes, Evod kits for the uninformed

 

[WattWick]

Edit: Got a bit carried away there... sorry about that!

 

[bwh79]

As stated several times already, the resistance isn't part of the equation. 60 watts is 60 watts regardless. So the real question becomes 'why bother trying to build a 0.1 ohm coil'?

Give us a reason why you think a 0.1 ohm coil will produce a better vape.

Voltage limits.

 

[haleysdadda]

i used 20g and got 0.10ohms on xcube II and a velocity RDA. isit safe?

It seems to me if your asking this kind of question you also should be letting us know why you feel the need to build so low with such big wire! Then maybe we can help you with a "SAFER" build that will achieve your goals!

 

[fenderstrat]

I really really am trying to stay positive as much as I can but I have to say I am TRULY AMAZED that at this stage of the vaping game that so much misinformation and sometimes just total bull s#%& still gets posted about batteries,I am truly dumbfounded.Do some of you do even the slighest research at all? and proof reading posts is priceless.....I said this elsewhere recently but we are literally talking about learing the basics here ,simple calculations from 5th grade not quantum physics.I understand not everyone wants to be an EE nor has the time but then again if you dont have the time to learn a few basic formulas.......then dont give advice on battery/coil threads.I dont give advice on coil building threads,why?cause I freely admit I dont know enough to add anything useful
this is not aimed at any one person,there are SEVERAL posts in this thread that had me shaking my head

 

[tj99959]

Well it's true, we are not trying to spit the atom here, but it's nice to know which direction an electron will flow.

BTW, quantum mechanics was a "required" for some of us.

add:
QMSEO1 is free at Stanford University if you're interested
Quantum Mechanics for Scientists and Engineers

 

[fenderstrat]

yes its not complicated stuff, literally watts =volts x amps or sometimes more precisely watts divided by volts=amps,thats all you need for some of this stuff,not all, some is more complicated.Ive never owned a mech mod so you dont see me over there commenting and again I dont build coils so I stay out of that forum, I just cant understand what compels people to post things so inaccurate

 

[sparkky1]

yes its not complicated stuff, literally watts =volts x amps or sometimes more precisely watts divided by volts=amps,thats all you need for some of this stuff,not all, some is more complicated.Ive never owned a mech mod so you dont see me over there commenting and again I dont build coils so I stay out of that forum, I just cant understand what compels people to post things so inaccurate

So what precisely would you use watts div by volts =amps for ?

 

[tj99959]

So what precisely would you use watts div by volts =amps for ?

Ohms law is a circle, so no matter what you need to know there are always three ways to find that information.

P/E will give the same result as E/R

 

[sparkky1]

Ohms law is a circle, so no matter what you need to know there are always three ways to find that information.

P/E will give the same result as E/R

I get that, I use it everyday for work, just wondering

what fenderstrat uses it for ?

 

[WattWick]

So what precisely would you use watts div by volts =amps for ?

For finding estimating how much stress a regulated mods puts on a battery. "Estimating" due to additional stress added to achieve desired (mod) output voltage, making the calculation imprecise due to unknowns.

Edit: Reworded.

 

[bwh79]

So what precisely would you use watts div by volts =amps for ?

To determine the amp draw on your batteries in a regulated mod for a particular wattage at a particular charge state (generally assuming 3.2v per battery or whatever the low-voltage cutoff is on your device, as that's when the amp drain will be at its highest.)

For example when vaping at 60 watts on a single-battery device you will be drawing approximately 60/3.2 = 18.75 amps. Add in an extra 10% (or whatever the known efficiency loss is for your device) and you will see that a single 20-amp rated battery is not sufficient for vaping safely at 60 watts.

 

[sparkky1]

To determine the amp draw on your batteries in a regulated mod for a particular wattage at a particular charge state (generally assuming 3.2v per battery or whatever the low-voltage cutoff is on your device, as that's when the amp drain will be at its highest.)

For example when vaping at 60 watts on a single-battery device you will be drawing approximately 60/3.2 = 18.75 amps. Add in an extra 10% (or whatever the known efficiency loss is for your device) and you will see that a single 20-amp rated battery is not sufficient for vaping safely at 60 watts.

20.83 amps
and with 6.4 volts @ 150 watts ?

 

[bwh79]

and with 6.4 volts @ 150 watts ?

150 / 6.4 = 23.4375 amps (not accounting for efficiency)

23.4375 / .9 = approx. 26.04 amps (presuming 90% efficiency)

You'd better be using 30A batteries if you're vaping 150 watts on a dual-battery device.

 

[fenderstrat]

just woke up...but thank you everyone for explaining,yes some of the calculations really are that simple on regulated mods(for a rough idea but enough to know if you are safe for the batts)...thats why when I see all this crazy stuff getting posted,its like WHAT???!!!
its why statements like "battery x is no good for vaping at blah blah ohms" are meaningless, if a battery is not damaged and is being used within specs, it's safe as it's gonna be

 

[tj99959]

just woke up...but thank you everyone for explaining,yes some of the calculations really are that simple on regulated mods(for a rough idea but enough to know if you are safe for the batts)...thats why when I see all this crazy stuff getting posted,its like WHAT???!!!
its why statements like "battery x is no good for vaping at blah blah ohms" are meaningless, if a battery is not damaged and is being used within specs, it's safe as it's gonna be

Yet folks still run out and buy $2 4 amp batteries, and think they're safe. "but it says they're Li-ion batteries" is all they know (or care to know)