Are Mechs Dead?

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Fattlestar

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Fattlestar or Bassnorma,

Let's see if I got this right. I could get a mech put my 18650 2500mAH 3.7 battery in it, attach my Delta II .5 ohm to it and according to the ohm calculator lets say fresh off the charger I pull 4.2 v straight from battery I would be pushing 35 watts through the Delta II which is well within its range. So I would be good right? Then when I notice performance drop off charge batteries. Do I understand how that works?

That all seems correct to me, you've got it right. Switch out batteries as soon as you feel the vape drop off and you're golden. I usually switch batteries ~3.7v or 3.8v, as that's where my builds start to sag.
 

Bassnorma

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That all seems correct to me, you've got it right. Switch out batteries as soon as you feel the vape drop off and you're golden. I usually switch batteries ~3.7v or 3.8v, as that's where my builds start to sag.

Just make sure that the Continuous discharge rating of the battery can handle the load, which is why I recommend a 30 amp CDR. You will not pull more amps from that battery then it can continuously discharge. If that 2500mAH battery only had a 10 amp CDR you would be overloading it with a 0.5 ohm build.

I believe the one calculator I posted has a battery section which lists the CDRs on various well known high drain IMRs.
 

jaxgator

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The main thing to be concerned with is how many amps you are drawing from the battery and what the battery's maximim continuous discharge rate is.

A .5Ω coil will be drawing almost 8 1/2 amps. If your battery has a maximum continuous discharge rate of 20a then you are well within the safe limit.

I try to stay 20% below a battery's maximum continuous discharge rate myself.
 

jaxgator

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If that 2500mAH battery only had a 10 amp CDR you would be overloading it with a 0.5 ohm build.

Actually, that's not true. It's closer to the maximum than I would want but it certainly isn't overloading a battery with a MCDR of 10A. It would be pulling 8 1/2 amps.
 

e-pipeman

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If you like mechs, fine. I used to have a Megalodon and loved it. These days I prefer regulated mods like the iStick and the MVP. I love their ease of use - you don't have to think about mollycoddling them or tweaking them. As simple as lighting a cigarette imho. To me mods are yesterday's news - but then I'm ancient so what do I know. Ymmv.
 

Bassnorma

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Actually, that's not true. It's closer to the maximum than I would want but it certainly isn't overloading a battery with a MCDR of 10A. It would be pulling 8 1/2 amps.

Point taken...but close enough not to have a decent safety margin...next time I will run it though a calculator....I think you would agree that running a 0.5 build on a 10 amp cdr while technically not overload is certainly inadvisable.....I tossed 10 amps out as an example. It's not enough margin for error.

A hard short in that scenario does not give you much wiggle room...

(sent from an alien device which translates English into Klingon without my approval)
 
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AndriaD

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Just make sure that the Continuous discharge rating of the battery can handle the load, which is why I recommend a 30 amp CDR. You will not pull more amps from that battery then it can continuously discharge. If that 2500mAH battery only had a 10 amp CDR you would be overloading it with a 0.5 ohm build.

I believe the one calculator I posted has a battery section which lists the CDRs on various well known high drain IMRs.

Hey, got a question for you: (I'm still a bit of a newbie when it comes to batteries!)

I just got some AW (yes authentic, from sweet-vapes!) 18490s, 1200mAh, and they were listed as being 18amp, which I think is their max draw -- on the battery itself it shows "15C" -- does that mean the continuous draw rating is 15amps? I'm in no danger of going near that, with my 1.4-2 ohm builds, at 11-ish watts, but was curious. I mainly got these because they cost the same as the 1100 mah AWs, and did show a higher amp rating -- figure it never hurts to have more than I need, especially when it costs the same as a lower-rated battery.

Thx!
Andria
 

Bassnorma

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Hey, got a question for you: (I'm still a bit of a newbie when it comes to batteries!)

I just got some AW (yes authentic, from sweet-vapes!) 18490s, 1200mAh, and they were listed as being 18amp, which I think is their max draw -- on the battery itself it shows "15C" -- does that mean the continuous draw rating is 15amps? I'm in no danger of going near that, with my 1.4-2 ohm builds, at 11-ish watts, but was curious. I mainly got these because they cost the same as the 1100 mah AWs, and did show a higher amp rating -- figure it never hurts to have more than I need, especially when it costs the same as a lower-rated battery.

Thx!
Andria

Baditude talks about this in this blog...
(12) Deeper Understanding of Mod Batteries - Part I

But basically you multiply the capacity of the battery (mah) by the C rating of the battery and divide by 1000 to get the Continuous Discharge rating of the battery in Amps...so...

2000 mAH (total capacity of the cell) times 15(C rating)= 30000 mAH which divided by 1000 is a 30 amp CDR.

So, your 1200 times 15 divided by 1000 is 18 amps CDR.

0.5 is safe...0.4 will draw 10.5 on a fresh battery....but 0.3 is pushing it as under perfect conditions it will draw 14 so a short would not be good.

Hope that makes sense....
 
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AndriaD

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I also leave more head room than some. I like the comfort factor.

I would also hate to suggest narrow margins to someone and have it go upside down....

Yeah, I lean to the cautious side myself. It's nice to know I have 18 amps available, even if my lowest build, 1.4Ω, at 10w is drawing less than 3 amps. Who knows, someday I might get wild enough to use a 1 ohm coil. Doubtful though; even this 1.4Ω is making so much more vapor than my usual 1.8Ω builds, it chokes me up sometimes. But I bought these AWs specifically for use in a mech, so it's great to have a LOT of leeway.

Andria
 

Bassnorma

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Yeah, I lean to the cautious side myself. It's nice to know I have 18 amps available, even if my lowest build, 1.4Ω, at 10w is drawing less than 3 amps. Who knows, someday I might get wild enough to use a 1 ohm coil. Doubtful though; even this 1.4Ω is making so much more vapor than my usual 1.8Ω builds, it chokes me up sometimes. But I bought these AWs specifically for use in a mech, so it's great to have a LOT of leeway.

Andria

Ah yeah...you are perfectly fine with that and with mid to high subohms if you feel like goin' buck wild! LOL

Of course this is all very personal but outside of the DNA40s, 0.8 is just about perfect for me. I have a couple built at 0.5 and I like it (with a lot of airflow on RTAs) but 0.8 seems to be a sweet spot for me.
 
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Bassnorma

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I'm a fan of .8 to 1 ohm range usually, and I tend to prefer single coils. Don't have to get fancy to get a great vape :D

I am with you there....except I sometimes like having all of that surface area on the dual coils. Not good for my juice budget though...lol.

Although the Reo is sporting a 0.8 Cyclone (single coil) with AFC and it just melts my little vaping heart! ;)
 

AndriaD

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I would probably love the hell out of sub-ohm vaping, if I didn't have asthma -- I loooooooooove throat hit, but I have to walk a razor's edge between great threat hit/asthma attack-coughing up a lung. So I have to build conservatively, but I recently discovered that Throat Hit Nicotine from VapersTek -- great stuff! Also I use some of the Flash additive from FlavorArt. So I can get the great TH I need, while staying at 10-10.5mg nicotine, and building coils that provide only moderate vapor (and using ejuice that's 83% PG helps with both!).

Andria
 

Bassnorma

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I would probably love the hell out of sub-ohm vaping, if I didn't have asthma -- I loooooooooove throat hit, but I have to walk a razor's edge between great threat hit/asthma attack-coughing up a lung. So I have to build conservatively, but I recently discovered that Throat Hit Nicotine from VapersTek -- great stuff! Also I use some of the Flash additive from FlavorArt. So I can get the great TH I need, while staying at 10-10.5mg nicotine, and building coils that provide only moderate vapor (and using ejuice that's 83% PG helps with both!).

Andria

Yes....I can see how that might be an irritant. Nothing wrong with vaping positive ohms. I mix it up myself.

(sent from an alien device which translates English into Klingon without my approval)
 

Chelonian

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If you like mechs, fine. I used to have a Megalodon and loved it. These days I prefer regulated mods like the iStick and the MVP. I love their ease of use - you don't have to think about mollycoddling them or tweaking them. As simple as lighting a cigarette imho. To me mods are yesterday's news - but then I'm ancient so what do I know. Ymmv.

The big thing is to vape what you like.

The reason I quoting your post, however, is because with the equipment you mentioned, vaping at the level that it can provide, something like an 18500 Workhorse and a KFL would provide you with years of hassle free, indestructable vaping.
Or, put a subtank or Atlantis if you dont want to build.
That would give you an all day vape with maybe one battery change.

To me, its the high power vapers who benefit the most from reg mods.


Redacted

PS
Not trying to change you. Just wanted to point out that in a lot of ways, the power you vape at is poster child level for mechs :)
 

jaxgator

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Point taken...but close enough not to have a decent safety margin...next time I will run it though a calculator....I think you would agree that running a 0.5 build on a 10 amp cdr while technically not overload is certainly inadvisable.....I tossed 10 amps out as an example. It's not enough margin for error.

A hard short in that scenario does not give you much wiggle room...

(sent from an alien device which translates English into Klingon without my approval)

Absolutely, that's why I said...

It's closer to the maximum than I would want

Incidently, because I know Ohms Law and battery safety, I am curently running a .24Ω build and have built as low as .18Ω.
 
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