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I understand that but they must have some similarities with the ceramic cup etc, is it also built with no res wire?

To be honest a lot of vape gear gets that reaction from me. Fancy paying 50 squids for a tiny glass tube with a tiny bit of stainless steel and a few o rings? The cage by leo fits the bill.
No matter how much it is dressed up there are more than a few people laughing all the way to the bank and kanthal costing as much as that puts it in the same category in my view.

A good quality 30 amp battery like a Sony VTC4 or VTC5 will be ok with far more than 15 amps. It's 30 amp rating is measured for continuous draw which means that you could have a 0.14 ohm coil and hold the button down until you drain your battery. You would however have a badly burned hand as this generates roughly 120 watts of power in your tiny atomiser coil.
Most people use coils with about 1 ohm to 1.5 ohms which is only 2.8 to about 4 amps, and even sub ohm cloud chasing at 0.3 ohms only uses 14 amps.
I'm not saying you don't need to be careful, or that nothing could go wrong because care is needed, and things do occasionally go wrong.
Buy good quality batteries,
Look after them - don't over discharge them and don't over charge them
Use a good quality charger
Don't use batteries with any damage or signs of wear and tear.
They aren't very expensive, dispose of old or damaged ones and buy new ones

A 30 amp battery will be as safe as any lithium cell can be right down to a resistance where the only people who are vaping are the same people who think playing in traffic is good family fun.

Don't worry about it really. I've had a few flights to different European countries lately and had no problem. Most of the time they don't even ask any questions, I suppose vaping is getting more common these days so airport security know what they are looking at

You'll definitely know when it's time to change your battery. I find anything less than around 3.5 volts and the flavour isn't there and there's much less vapour.  Basically if you have a setup that was really good an hour ago and isn't much use anymore it's time for a fresh battery.  
Use your zmax to see the charge on your batteries before you put them on charge and they will probably still show 3.4 to 3.6. 
Try aiming for between 1 ohm and 1.3 sometime.  Personally I find that's where my kayfun is best.

Sorry don't have one but pink mule have them in stock ss brass and mixed.