So I've been experimenting with sub ohm coils. I had my first great success tonight on one of my smoktech RDAs that I had been modding recently with newly drilled holes and what not. .8 Ohms, cotton, 4 wraps, twisted 32 gauge. I put it on my mech threw in my samsung 2600 mah 18650 and was blown away by the vapor. Insane clouds! So extremely happy I took away one of the sleeves on my sigelei #8, so that I could return my other battery to its home and threw in a 1200 mah protected 18350 trustfire battery. Fired it up, and more clouds!.............for a few seconds...then my mech stopped firing...So I hit the button again and the same thing happened again. So to troubleshoot I through my 18650 previously used back in and no problems. What is causing this? I can only assume my amateur knowledge of batteries has struck at a less than opportune time. Thanks for any responses.
Firing Issues With Low Ohms
- Thread starter Bobee
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The PCB/PCM protection circuit is limiting the amp draw on that protected battery. They have an actual little board that does the 'protecting' mounted at the positive end of the battery -- it's hidden by the wrapper, but if you look you can see where it sits.
So that means these trustfires are a no go for what I'm doing? I was going to order some Efest IMR 18350s soon. I figure I might as well go with the general consensus on what was best to use, since my knowledge is limited. I've researched a ton, but all of this battery stuff seems so foreign to me lol
I stick to AW IMRs for the most part, especially in mechanicals. I have a few Efest IMRs in various sizes (same battery chemistry as the AWs) as well, but I really only ordered them to make a vendor order worthwhile. The AWs are worth the slight premium you pay.
And you're right; protected batteries and super-low-ohm vaping don't go well together.
And you're right; protected batteries and super-low-ohm vaping don't go well together.
I'd say change your build first. The twisted .32 is putting major stress on your batt that the batt can't handle it. If you want to go with twisted wire try .20 twisted. If you want more fun try .20 twisted wire wrapped around mesh. 
I made a .5 ohm coil a couple of days ago. I have 4 Trustfire 18650 (flame) batteries and 1 AW 18650.
The AW 18650 fires without any problem but just 2 of the 4 Trusfires are firing. Does this mean that the PCB's on the 2 batteries that fire are not working?
The AW 18650 fires without any problem but just 2 of the 4 Trusfires are firing. Does this mean that the PCB's on the 2 batteries that fire are not working?
Pretty please, people, I'm begging you, do NOT use protected lithium batteries with a sub ohm coil! They can't handle the amp draw required to push a coil of that resistance. When that protection circuit fails, that battery will explode like a bomb in your mouth! If you're not sure whether you have the right batteries that are able to handle enough amp draw to do it, assume you don't and get the right ones. The last thing the industry needs is a slew of accidents from misinformed users practicing dangerous techniques without the knowledge and experience to do it safely. I'm not pointing fingers, but this topic has been coming up way too often as of late, and I'd hate to see someone get seriously hurt from using an e-cig improperly.
Rant over, Cjax out!
Rant over, Cjax out!
thats around 8 amps plus on a new battery , if its not rated at such it should kick in in seconds, i would never use fires i seen enough bad news with them. in a mech i say skip the protected and go the other route. get some kicka** high drains and get something like a vapesafe fuse. those new 30 amp batteries look like the way to go now a days.
Only problem with the vape-safe type fuses are they kick out at either 5 or 6 amps depending, so for a .5 ohm coil, that would trip the fuse as well. I generally keep my coils at around .7-.9 I only use batteries rated for 10 amps or higher. At the lowest end, my coils push 6 amps on a fully charged batt, so it's iffy with a fuse.
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