The Cool Fire 1 isn't for everyone, but if you like 8 watts it provides a nice vape. In stock form with an 18350, I can get about 5 or 6 hours of use. That's not too bad, and I like the size. However, sometimes I like to use an 18650 for increased battery life. The problem is the Cool Fire 1 is only an 18350 device.
I found an extension tube that works quite well with an 18650 battery. It is from a sigelei #8. It adds 30mm or 1 1/16" to the length. You can just screw it on if you want, but there will be a 1mm gap at the top. I removed about 1mm from the top threads of the extension tube and removed that gap as you can see in the pictures.
The finish isn't exactly the same, but it is very close.
So if you have an old sigelei #8 laying around, give it a try.
I found an extension tube that works quite well with an 18650 battery. It is from a sigelei #8. It adds 30mm or 1 1/16" to the length. You can just screw it on if you want, but there will be a 1mm gap at the top. I removed about 1mm from the top threads of the extension tube and removed that gap as you can see in the pictures.
The finish isn't exactly the same, but it is very close.
So if you have an old sigelei #8 laying around, give it a try.
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