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The above picture is a comparison shot of a cigarette with a couple of mini-sized batteries and three "eGo" size batteries. All are from the Smokeless Image lineup.
These are considered semi-disposable, because these rechargable batteries have an expected life of 250 charges. After that, the entire device must be replaced with a new battery. These are what most new users start out with because their smaller form factor is closer to cigarettes and are cheaper to buy initially. The mini-ecigs have a battery use of 3-4 hr and the larger cigar-sized batteries have a battery use of 6-10 hours or more. Because of their slim form factor, they are limited to juice carriers that are smaller in capacity.
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The above is an advanced personal vaporizer or APV, or mod, a Provari made by Provape. This is a heavily constructed metal tube meant to hold smaller replacable, rechargable batteries much like a flashlight does. These devices are more durable and will last years in comparison to the less durable devices described above. They are significantly larger in size and weight. They are more expensive initially, but consider they will last longer. The batteries that these use are cheaper (< $10), have a lifetime of 1 year, and can have a working duration of 8 hours to all day or more. Being larger devices, they are better able to carry larger capacity juice carriers of 3-8 ml of liquid that can last 1-3 days.
