You have 1amp wiggle room with those if what others said is true. So aslong as you stay at 40w- at .5ohms you should be ok. I normally like 5 amps wiggle roon, thats me though. I dont know the efest batts, but the usually have a much higher pulse limit which usually ranges from 10-70secs. They aint the best batts out but should be safe for wht youre using then for.
urgent? safe battery for sub ohming. newbie
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From my standpoint and reading the specs on fasttech website, it says it fires from 1.0 ohm to 5.0 ohm, I currently would not run a sub ohm coil on it. There are reasons for specs and I usually follow by them as to not take any unnecessary measures. I am all for an enjoyable experience personally. The only annoying question is the one not asked. 
As far as the Efest goes, I have not personally used it or even read up on it yet because I do not own it. It also states that it has some protection from: Auto warning of overvoltage and low-voltage and also •Reverse battery protection, over current protection. So if you run it as it should be ran, I do not think you would run into problems but as with any electrical item, something can go wrong but chances are less likely when ran by specifications. With all of that, I would use it but only with a coil between 1.0 ohm to 5.0 ohms and possibly if I read up on Batitude's blog about the battery first.
As far as the Efest goes, I have not personally used it or even read up on it yet because I do not own it. It also states that it has some protection from: Auto warning of overvoltage and low-voltage and also •Reverse battery protection, over current protection. So if you run it as it should be ran, I do not think you would run into problems but as with any electrical item, something can go wrong but chances are less likely when ran by specifications. With all of that, I would use it but only with a coil between 1.0 ohm to 5.0 ohms and possibly if I read up on Batitude's blog about the battery first.
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From my standpoint and reading the specs on fasttech website, it says it fires from 1.0 ohm to 5.0 ohm, I currently would not run a sub ohm coil on it. There are reasons for specs and I usually follow by them as to not take any unnecessary measures. I am all for an enjoyable experience personally. The only annoying question is the one not asked.
just the answer i was looking for, thanks alot!
What better safe batteries did you get? There's a lot to learn and be explained here and I'll let someone who can better explain it do so.
But as simply as I can put it and from what I can understand from you: any 18650 battery you put in a regulated mod will more or less be "safe" because it shouldn't let you vape it at dangerous levels for the battery.
There are only 3 companies that make batteries that are typically used safely for mods: Sony, Samsung, and LG. Everything else out there (Efest, MXJO, etc.) is most likely (and many times proven) a re-wraps of a battery made by Sony, Samsung, or LG. Efest has been proven to "wrongly advertise" the continuous discharge rating of their batteries. It is most wise to do your best research before you even purchase one of these high drain batteries.
What does the Vamo instruction manual or whatever recommend for what battery to use in it?
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The efest and Samsung are the two safest batteries to date I wouldn't worry just make sure you put them in the right way haha!!
I don't even understand why anyone is talking about wiggle room here. Aren't you only using these in a Vamo? That's a regulated mod right? It's supposed to protect you and regulate the voltage correctly. Now if you're talking unregulated, then whether 1 amp wiggle room is enough is up to how much you value your hand and face.
Another thing: if you're talking about strictly the kanger subtank, you don't even have to worry about 40 some watts or whatever. Anything past 25 watts on the 1.2 ohm coil gives you dry hits and on the 0.5 ohm anything past 30 gives you dry hits.
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Another thing: if you're talking about strictly the kanger subtank, you don't even have to worry about 40 some watts or whatever. Anything past 25 watts on the 1.2 ohm coil gives you dry hits and on the 0.5 ohm anything past 30 gives you dry hits.
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What I believe he is referring to are the Efest purple 2500mah (which are just re-wraps LG HE2s btw) with advertised 35A rating which is the pulse rating which doesn't matter at all, and the Samsung 2500mah blue 25Rs. They both have a continuous discharge rating (CDR) of 20A which is double the CDR of your 3100 Efests so either of the two I mentioned are "safer". The 3100mah just means you get longer battery life.
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thereal6god, regarding your battery, the purple Efest 3100 mAh, if you go to the link Susan gave you to Baditude's blog, it is thought to be only rated for somewhere between 4 and 6.4 amps continuous. Here is a good review of it.
From the review:
"This cell is advertised as 20A. However it is based on a Panasonic NCR18650BE which is rated anywhere between 4A and 6.4A max continuous discharge. Performance test results put it on a level between NCR128650B (6.5A) and Panasonic NCR18650PF (10A) and is doing fine there."
At 40 watts, 90% board (regulator) efficiency and a battery at 4.2V, you'll be drawing 10.6A from the battery. Coil resistance does not matter, if you set 40 watts you get 40 watts no matter the resistance so battery drain will be very similar at any resistance. As your battery drains its voltage drops so the regulator will need more amps from it to make the watts. When it gets to 3.2V at 40 watts the amp draw will be 13.9A. At 15 watts it will draw 5.2A.
I would not use that battery at more than 15 watts.
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Regulated mods protect you from shorts and over discharging a battery. In a mod that goes up to 40 watts, the mod assumes there is a battery in it that can handle the maximum current drain, which in this case is around 14 amps.
You are absolutely right. I had a brain fart, but not completely because I asked what battery the manual recommends!
Yeah, I would not use that battery for subohm vaping.
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