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200W with 2x18650? Again?
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#11 (permalink)      12/27/2015 2:05:05 AM US Central   quote/reply + tips
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Nuggy1980 wrote:

Pulse ratings do not exist.

That's a pretty big statement, especially if you look at a Samsung 25R datasheet and see the 100A max instantaneous discharge rating... (.5 seconds, and some of them even mention the 6 second rest period after too)

Edited on 12/27/2015 at 2:05 AM. Reason:
Woah, mama!
#12 (permalink)      12/27/2015 2:15:42 AM US Central   quote/reply + tips
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A lot of the new iterations of enclosed cells in mods comes with the recent 20650 li-something batts which are supposed to give awesome perfs
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#13 (permalink)      12/27/2015 5:12:31 AM US Central   quote/reply + tips
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Nuggy1980 wrote:

Pulse ratings do not exist. Fabricated. Show me any true battery manufacturers that list a pulse rating (not a re rap)

Good point, which I see someone else here didn't quite get.

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#14 (permalink)      1/17/2016 12:20:31 PM US Central   quote/reply + tips
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There is no industry standard (currently) for pulse ratings. As such, there is no standard definition of how long a pulse is. Remember that these batteries were never designed with "pulse" in mind. No one pulses a laptop or a Tesla (on the extreme side).
Trying is the first step to failure... - Homer Simpson
#15 (permalink)      1/17/2016 5:00:50 PM US Central   quote/reply + tips
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+1 details
^Pulse ratings have an overwhelming importance for laser guns.
#16 (permalink)      1/17/2016 5:44:14 PM US Central   quote/reply + tips
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jorgelarocha wrote:

^Pulse ratings have an overwhelming importance for laser guns.

And lets us not forget heart rate. Without a pulse rating, life for some would be pretty bad.

Never play with matches. You might burn the skin off your face.
#17 (permalink)      1/17/2016 6:24:53 PM US Central   quote/reply + tips
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Saient wrote:

Have fun bursting a 25r to 100A @ .04 420W destroying your battery and having your vapour hotter than the sun. Your battery recovery time would be a couple minutes and it'd probably be dead in a few hits, not to mention take significant cell damage and vastly reduce the life of the battery.

The more he abuses them, the greater their devotion grows, since the psychological cost of admitting their mistake is ever higher...
#18 (permalink)      2/16/2016 7:06:51 PM US Central   quote/reply + tips
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0.32 Ohms at 8V = 200W @ 25Amps. Not a problem with 2 series/parallel 18650s.
“There is more to life than simply increasing its speed.”
#19 (permalink)      2/16/2016 10:09:36 PM US Central   quote/reply + tips
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LG 30A 18650's can handle 200w in parallel. 25R's should be safe as well, but you'll wear them out faster using them at 200w all the time. Any other reputable 20A 18650, I wouldn't use over 160w. And of course, Efest, ____fire, whatever, you're probably asking for hot battery juice running down your hand at over 100w.

Truth be told, there's no reason to vape at 200w with 99% of regulated and even mech mods, because the chip/MOSFET won't let them fire below .1 ohms. There's nothing you can build above .1 ohm that has any ramp up time or increased vapor production past like 120-140w. If you're using temp control, the amount of time your batteries actually spend at 200w would probably be like .2 seconds the first time it's fired at room temperature, so you're not really vaping at 200w there either.