Ok so I am totally new to the vaping scene and I have a few questions I haven't been able to find by searching. First what is the big deal with ohms and resistance? Can I not use any KR808 carto on any KR808 Batt? What does the ohm and resistance have to do with the VG or PG liquid? I was going to buy some E-liquid to refill the cartos with so is important I know the whole Ohm/resistance thing? Since I am new to this my plan was to get a couple different 808 batteries and carts and maybe try a 501. Would I be able to charge all the 808 batts on the same charger? And I know this is such a dumb question(Because it is asked all the time I'm sure) but what would a good beginner 501 cig be? I will only be getting one 501 so what should it be? Is it worth it to get a tank(or Cartomizer ) for an 808? which one is the easiest to use if so? I know these are probably some dumb questions but I have been on here searching and learning for a little over a week and I think I may be over saturated with info, because I don't know what to buy . Please help
O.K., here goes: KR808D1's (808's) are generally compatible between devices and cartos. 808 and 510 refer to thread patterns. Some 808 parts have a slightly different design that may interfere with their use on an 808 battery by another manufacturer. This is a sleazy trick used by some ecig makers to force you to buy their product. I would drop them.
Devices, (batteries, atomizers, cartomizers, etc) with a 510 thread seem to be more often compatible with one another. An exception would be some of the 510 cartos designed for the eGo/Vgo/Riva/Kgo type batteries. These batteries have a cone on the end of them as well. There are adapters you can use to put a eGo type carto on an ecig with a standard 510 thread. There are also adapters that you can use to put an 808 carto on a 510 thread, as long as it is a standard type of 808 carto. IMO, if you want maximum interchangeability and the widest variety of cartomizers, tanks, attys, etc., get a battery or mod with a 510 connector and perhaps a 510/808 adapter for standard non-proprietary 808 cartos, which are not bad.
The thing with Ohms (resistance) and Volts is that they combine to create power (watts). The higher the watts, the hotter the coil gets and the warmer the vapor is. Of course, the faster your battery drains and the faster your atty or carto wears out.
Most people like to vape with between 6 and 10 watts. Some hotheads like up to 12 watts. Attys and cartos are rated by their resistance. A "standard" atty or carto is about 2.5ohms to 3.1 ohms. A "low resistance" atty is generally considered to be 2.0 ohms or less, down to about 1.25ohms. There are "high resistance" attys too, up to 4 or 4.5ohms.
The formula for power is Vots X Volts (battery voltage squared) divided by the resistance of your atty in ohms = Watts.
For example, if your battery is putting out 3.7V to a 2.5ohm atty, you have 3.7 x 3.7 / 2.5= 5.48 Watts. When a 3.7V battery is fresh off a charger, it's 4.2 volts. 4.2 x 4.2 / 2.5 = 7.06Watts. So, you can see that as the battery voltage drops with use, the power (watts) goes down. By the time it reaches 3.7 Volts, the vapor is getting a bit weak.
You can either increase the voltage by using a 5V passthrough, stacking two 3V batteries for 6V, or using a variable voltage PV. Or, you can use a lower resistance atty. If you are using a 1.5ohm atty and your battery has gotten to 3.7V, then the formula is 3.7 x 3.7 / 1.5 = 9.12 Watts. That's much better than the 5.48 watts you got from a 2.5ohm atty and you didn't have to increase the voltage at all.
That's the relationship between voltage, ohms and watts. You can plug different values in to achieve the power that tastes best to you for the juice you use. Some juice tastes better at lower power, some at higher power. High voltage can make some juice taste burnt. Some juice comes alive at high voltage. High voltage creates more vapor, but it also burns up more juice. It's a balancing act.
VG and PG don't have too much to do with the power you vape at. VG produces more vapor, PG gives more throat hit. You can get some of the throat hit back with high VG juice by increasing your power.
Remember though, Low resistance attys put a lot of strain on your battery. You shouldn't use LR attys with a battery less than 450mah. Too much voltage in a LR atty will burn it out, sometimes instantly. To little voltage in a high resistance atty will produce little or no vapor. For a standard 3.7V battery, 2-2.5ohms is a good starting point.
A good beginner 510 is an E-Power. It has replaceable, non-proprietary batteries and you can get repair parts. Another good one is a kGo. Neither of these looks like a cigarette, but they don't look like a pipe bomb either. They're about the size of a Sharpie pen. You can use any carto or atty with a 510 connector on them, or you can use most 808 cartos with a 510/808 adapter.
Hope that wasn't too confusing and cleared up some questions for you.
