How do you guys wick your < .5 ohm builds? Cotton? Silica? prewound or threaded?
Also are those Sony vct4 batteries basically the end all right now for sub-ohm vaping safety?
Cotton balls every time. I take a piece and then roll it until it looks like a wick and then thread it through the coils already in whichecer atty that I'm building.
As far as batteries go, you need to look at the C rating for a battery or the maximum continuous discharge rate of the battery. As long as the battery is capable of draining at the amperage your coil requires it is okay. The reason why you see a lot of the green sony batteries with subohmers is because they have a maximum discharge rate of 30 amps which is more than any safe coil setup would require. What you need to do is find out the maximum discharge rate of the battery you have and don't build coils that require more current than that. I'm using the green sony 30amp batterys and my dual coil is 0.3 Ohm.
0.3 Ohm @ 4.2 Volts (maximum voltage the battery can supply without boosting, which mechs do not) would draw 14 Amps which is well under the limit of 30 that the battery has so it is completely safe. As the battery voltage drops the current will decrease so 14 Amps would be the max you will need for a 0.3 Ohm coil. As coil resistance goes up less current is needed and as coil resistance goes down, more current is needed. Look into Ohms Law and all of your questions about this stuff will be answered.
Maybe it is because I have never tried it but isn't this painful?
I have never tried the sub ohm thing before but I picture it as being overwhelming. Maybe I have it all wrong.
Did you have to work your way up to it or was it OK from the start?
Some people cannot handle it. Most vapers I run into on the street can't handle it and immediately start coughing (I don't let everybody try mine but I let some). Subohming is not for everybody, as the nic level gets higher its more like breathing in glass lol. For me, 6mg is my sweet spot. Anything higher than 6mg and it hurts to inhale. Some flavors are rougher than others like I have some flavors that are the same nic and pg/vg mix but hit completely different. For most juices at 6mg 50/50 I get enough throat it to know it's there but no where near enough to make me cough or hurt my throat. Some people have different tolerances to inhaling things than others. Some people can handle the amount and heat of vapor you get with subohming, others cannot. While a good microcoil can produce similar results to subohm setups (I subohm with microcoils anyways so mmmm flavor central) currently the most any regulated device can produce is around 20 Watts. With subohming you can get 40-60 Watts easily. Watts (power) is the amount of energy going into your coils and vaporizing eliquid. While some people may say a micro coil on a regulated device produces similar results to a subohm coil, they are not the same and produce completely different vapor. With regulated devices and higher resitance coils, the coils take longer to heat up which means it takes longer to start vaporizing liquid, this leads to a cooler and less responsive vape. With lower resistance coils, you get a faster heat up time and a more responsive vape.
As I'm sure you've heard and figured out by now, subohming is often compared to a good micro coil on a regulated device. I think this is ridiculous because they are completely different. They may produce what are considered by some to be similar results, they react in completely different ways and as a result produce different vaping experiences.