Brilliant, thanks for he indepth response. I've got some learnin' to do
fairly easy once you get the general idea. Pretty much in a nutshell, batteries have a maximum input/output amperage. Too much output (or too fast of a charging) and you will overload and cause the battery to get hot. do not exceed the maximum limits of the battery or it could "vent". Most of the videos I've seen where they vent a "safe chemistry" battery show a minimal and small "fizz" of noxious fumes comming out of the battery when pushed past their limit. However, I have seen some videos/pictures of the EGO type batteries actually building up pressure and shooting like a bottle rocket off their charger. All these are due to overstressing the battery. So, it's just a good idea to stay within the limits of the battery. If you don't know what the amperage of the battery is, then I'd get one that you do know of... and get one that has a high amp discharge rating.
Once you know the amp limit, the next thing is just to build the coil(s) that you like. I like to use a .8 to 1 ohm coil in a Kayfun using 28 gauge. I use that on my mechanical mods. The Kayfun offers a nice build and taste quality and is easy to setup. Most people gauge their coils by how many "wraps" they use, but I tend to stick with just an ohm rating. I have gavitated to using a rather small coil. I wrap mine around a tiny screwdriver for the most part. When I wrap dual coils, I usually end up wrapping my coils around round toothpicks since I can keep the coil wound while I screw them into the posts. Once wrapped, and screwed into the posts, I take it out of whatever I wound it around and test the ohms with the meter. When the ohms are satisfactory, I put the base of the kayfun on the mod and fire it. I have ceramic tweezers, so I tighten my coils while they're red hot. but if you don't have ceramic tweezers, you get them hot, then squeeze them while they are cooling down being careful not to fire your mod while your tweezers are on the coil. Once the coil is compressed, I usually insert what I wound it around just to make sure the coil is still in line.
Now, for the cotton, you'll be amazed at how little cotton is needed. I tried to use silica, but for some reason, silica is actually harder to replace than cotton. I was first a nay sayer of cotton, thinking that it wil burn too often, but if taken care of, it will last quite a bit and is easy to replace.. and cheap. The ammount of cotton varies with the atomizer or how I want it to wick. The best thing to do is trial and error for yoru first time. Take a little off the ball, and shape it into a "tube" that will fit into the coil. Pull it through the coil until you get some "resistance" between the cotton and coil, then snip the edges. Wet the wick with juice then test fire it. Tuck the moist wick down the side of the kayfun platform then assemble the kayfun and fill it halfway, then vape for a bit. The reason I said fill it halfway, is if you did the wick wrong, you'll have to empty the tank before you can re-wick it. The catch 22, is the more the tank is filled, the less vaccum it can hold, so it might leak for a bit. but until you ge the hang of it, it's what you have to do. IF it gurgles a lot, that means you have too thin of a wick, or the wick is too long... snip it a bit. If it gets dry hits, that means you probably have too much cotton or it's not long enough.
One atomizer I recommend for beginners, is the Squape or a
Squape clone.. It is by far the easiest mod to rebuld and work on. After I wrap the coil around a toothpick, I insert the toothpick into a slot and tighten the posts. I compress the coil then insert the cotton. The cotton should be as long as that slot.. no longer. If I make a mistake, the coil/wick can be taken out without having to empty the tank.
anyways, just thought I'd be a bit more informative.