Purple efest 18350 test

[fortytoo27]

Does anyone know where I could find test results for the purple efest 18350s? Almost all the data I've seen is for 18650 batteries.

I found a spreadsheet on pbusarsdo's battery information page, but it in addition to seeming really conservative, it said the max discharge for the purple 18350s was 7a and 8a for the old v2. I've heard that efest often inflates their specs, but I doubt the newer version of their battery has a lower max discharge than its predecessor-- especially when a supposed 10.5a cdr is their selling point. Because of that, I have to assume the spreadsheet is wrong, but I can't find any other tests either.

Right now I'm running a build at around .55 ohms on my Samsung 20Rs and I want to be able to change form factors with that same build. But I'd like to make an educated decision about how likely I am to blow my face off, based on more than just efests specs.




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[State O' Flux]

Although I generally use continuous discharge rate when cautioning other, mostly unfamiliar with Ohm's Law, vapists in their first forays into sub-ohm and unregulated mods, I suspect that you are a decent bit past that point, so... lets do a little light brain calisthenics, forty. ;-)

Pending any actual instrumented testing, one could speculate that the "10.5A" purple battery falls somewhere between a 7-11 amp continuous output, fully charged. Optimistically conservative? Is that an oxymoron?

Efest doesn't list the momentary or "pulse discharge" rate (PDR)... which for most vapists, may actually be the more useful number. Pulse discharge - arguably, 5-10 seconds is considered a pulse (some say 30 seconds!) - is usually 2-3 times that of the continuous discharge rate (CDR).

A random Google search example is the MNKE 18650 1500mAh battery. Depending on who's advertising you're reading, they have a maximum CDR of 25-30A, and a maximum PDR of 60-80A.

If we were to extrapolate... that a fully charged 7-11 amp CDR rated battery had a PDR rate of 15-30 amps for 10 seconds, then
- if one's draws were in the 5-10 second range, and
- if one were quite experienced with both Ohm's Law calculations, and using AW IMR or Efest red or purple 18350 batteries, then
- one might also determine using an atty at 0.5Ω with said batteries... is reasonably safe. ;-)

And now, back to our regularly scheduled programing. G'Night.

 

[fortytoo27]

Thanks, that's really helpful. I use really quick draw, 1-2 seconds mouth-to-lung, so I should be fine in that respect... It's good to know my face has an excellent chance of remaining intact.


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[Froth]

I have two of the Efest purple 18350's that I have used with a dual coil .45 ohm dripper, You should be more than fine with a .55 ohm setup IMO. Mine didn't even get hot with 3-4 second pulls, the battery got slightly warm but nothing I personally worry about. Granted the 700mah lasted me about 30-40minutes before the battery was a 3.5v, so it never had a lot of time to get hot haha.

 

[Kemosabe]

i use my purple efest 18350s at 0.5Ω with no warmth whatsoever. i typically take quick draws (3 seconds perhaps) but often times my 24g nichrome takes a while to heat up so even longer 'draws' are fine in my experience.

 

[Froth]

Just as an update, this was posted on some light forums a few days after the last post in this thread.

Test/Review of Efest IMR18350 700mAh (Purple) 2014

The conclusion is that it is a good cell, and can truly handle the 10.5A it is rated for and it is rated for 10.5A Continuous so there should be little to no worry whatsoever even building down to a .40 ohm setup. Cool stuff, glad to know they've been tested and stood up. I did actually laugh out loud at the 10A drain time being under 5 minutes, but you have to expect that with 700mah.

 

[Cole J]

Awesome info! Now i feel better that i ordered 2 of these so i can have a small mod on my desk at work without drawing any attention!