Innokin Cool Fire 2

[VapieDan]

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[steel bender]

Anyone else see what I'm seeing? I'm posting this in more than one place, hoping to catch a few more eyes and possibly someone knows the answer...

This mod may actually BE a grenade! Did I do the math right? Am I missing something? The innokin Cool Fire II is listed as having a Built in 7A fuse for protection and stability. It's also listed as only being able to accept an 18350 battery. My efest imr 18350 battery has an 8C rating. So, 8 x 800(mah) / 1000 = 6.4A max continuous discharge rate. RTD Vapor lists their aw imr 18350 batteries as only having a 6A max cont discharge. So the battery could be pushed beyond it's limits before reaching the "grenade's" safety limit?

 

[steel bender]

Well, ok, so apparently it also has a .6 ohm +/- .2 protection and it only can go up to 12.5 watts, so using an ohm's law calc with 12.5 watts and .4 ohms (worst case scenario from +/-.2) shows a max amp of 5.59, so it's probably ok. But if that's the case, why did they upgrade to a 7A protection fuse ( the svd only has a 5A fuse)?

 

[steel bender]

As K_Tech has already corrected me, it's a 7A current limiter, not a fuse...

 

[Mike.S]

Never heard of a fail-safe, eh?

 

[steel bender]

Never heard of a fail-safe, eh?

Well, at first glance it seemed weird having a fail safe higher than the battery itself, in other words no real safety at all, but as it only goes up to 12.5 watts and only as possibly low resistance of .4 ohms, the amps should never exceed 5.59 anyways, so having a 7A limiter seems almost useless, wouldn't a 5A actually be safer, adding another layer of protection before reaching the batteries limit.

I'm no expert, so please please PLEASE, correct me if I'm ever mistaken or especially flat out wrong.....

 

[03FXDWG]

You blind?! Of course it does!

I think it looks more like the barrel from the Barrel full of Monkeys game. I also think the shape would be easier to hold than a skinny ego battery and easier to grip. The weight is a concern, though. I wonder why they made it so heavy?

 

[Mike.S]

Well, at first glance it seemed weird having a fail safe higher than the battery itself, in other words no real safety at all, but as it only goes up to 12.5 watts and only as possibly low resistance of .4 ohms, the amps should never exceed 5.59 anyways, so having a 7A limiter seems almost useless, wouldn't a 5A actually be safer, adding another layer of protection before reaching the batteries limit.

I'm no expert, so please please PLEASE, correct me if I'm ever mistaken or especially flat out wrong.....

The battery rating is for continuous draw. A very fast acting 7A fuse may blow in <1 second @ 14A, before there will be a problem with the battery itself. The idea is to protect against catastrophic failures (none of your figures are meaningful, because they all assume a properly functioning device), without the fuse blowing during normal operation and leaving the device useless.

 

[steel bender]

The battery rating is for continuous draw. A very fast acting 7A fuse may blow in <1 second @ 14A, before there will be a problem with the battery itself. The idea is to protect against catastrophic failures (none of your figures are meaningful, because they all assume a properly functioning device), without the fuse blowing during normal operation and leaving the device useless.

Yes well, looking at it that way, it makes sense. I guess I was only looking at the range of current draw between 6 and 7A, which could possibly be over the batteries rating but under the devices protection...

I guess this was more about me musing, thinking about these things and learning than any real concern about a potential hazard.

 

[TUC]

I have a Cool Fire 2, and at first I really didn't think I would like it...but I find myself using it more and more. It will fire with a 1.0 ohm coil, I tried a 0.6 ohm, but it wouldn't allow it to fire. It is one of the most ergonomic mods I have. My only concern is it has aluminum threads, and the negative post is under tension. When replacing a battery, I need to make sure I am applying enough pressure to the end cap while threading.

Weight is at 199 grams, or 7 ounces(empty).

The Cool Fire 2 is an awesome mod.

Full review here.