Breaking it down:
All egics (even the cigalikes - that look like cigarettes) are made up of the same basic components:
1) battery to power the "atomizer"
2) "Atomizer" to turn the
eliquid into its gas state
3) something to hold the liquid until the atomizer requires it
4)
eliquid - flavored liquid to be atomized, usually containing nicotine.
"Coils", "heads" etc usually refer to a replaceable component that is basically the atomizer. after use the coils get "gunked up" and need to be replaced. these coils come in different resistances measured in ohms. The lower the resistance, the faster it heats up and the warmer the vape is. Higher ohms gives a cooler vape usually, and will allow your battery to last longer.
"Ego" style batteries are a skinny stick battery that are usually about the size of a skinny cigar. Batteries are measured in mAh - mili Amp hours. The more mAh the longer the battery will last.
"APV"s (Advanced Personal Vaporizers) are larger devices with more power for a better vape and a larger battery for a longer life. they offer advanced features such as a display to show battery life, coil resistance, allow variable voltage (vv) and/or variable wattage (vw). Some have replaceable batteries, others have non replaceable batteries.
"Tanks" contain atomizers that are user replaceable (twist the old one off and pop the new one in), though some are just throw away tanks. I think all the kanger tanks take replacement heads in one variety or another.
most of that should have been covered in baditudes blogs.
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