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It's not such a concern with a good battery phatfil. The AWT 18650 had an IR of 76 milliohms and was a worry. I have the 18350 from JacVapour and thats measuring 27milliohms. An 18350 that wipes the floor with an 18650 in that respect. I'd happily vape a 0.5ohm coil on that with no worry.

Silicone takes the win in my mind. Any rubber o-rings would have to be 'food grade' or you risk nasties leeching into your juice - this bumps the price up - silicone is a lot less volatile.

That's what I thought as soon as I saw it. Maybe extend it for a tight fitting bottle (no need to remove the lid to refill). Wouldn't leave much space for a board though. Maybe a mosfet?

I'm out of my territory here, I'll get back in the box.........

It's the CSI in me. Won't let go til I have the answer

The true specs for the size of this 18650 is 66.5mm x 18.5mm dia. Explains the size problem.

The button cap is tack welded straight onto the original positive contact. Mine is slightly longer due to the button cap being tacked on skew-wiff. Does that ring any bells?

No rippers here mucker, just a good RSM style bollocking (where needed)

I wasn't a good boy, ROP may mean something completely different 

Your humour gives it away  thumb up

14 yrs a Sapper, can spot a mile off

IR is not a definitive yardstick, the same as nothing else is. But as battery Currents rise it's becoming more and more important with regards to voltage sag at higher currents, and internal heating of a battery.

Many choose to just go for the 200-300 cycles, or when a mod rejects a battery a lot earlier than it used to.

All the things that affect a batteries life are factored in when we use 2.5Volts to work out the battery needed for a regulated mod. It includes a certain amount of headroom for the changes to a battery for it's useful lifetime.

It's not been mentioned before because this whole thing is a massive can of worms, but in regards to degredation, mech users are on their own. They have to learn to spot the subtle changes before they become a problem. But by the nature of the beast, mech users are buying new batteries a lot more often. I've gone through 3 full sets of batteries in the last 12 months, not because they're dying but because I'm looking for better.

If I was to make a guide that included everything about batteries it would take a week to read and would double the size of the forums (besides taking a couple of years to compile and proof read). I consider IR an important enough subject to bring it to peeps' attention now, and to help them protect themselves.

@scooby, thatguy your points have been taken in, and appreciated. There will be some information included, but I'm already having to restrict myself. And I have to admit I'll have to research a little further myself, it's something I've been ignoring myself

I'm not being flippant about it, just realistic. I will probably include some links to the Battery University with regards some of the tougher material.