The E-Cigarette Explained. 
The battery: this can be auto (fires
automatically when you inhale) or manual (press power button to activate).
Larger batteries tend to be manual batteries as manual switches offer more
control and reliability. Batteries also come in various sizes, the larger
the size the more charge it will hold. Battery capacity is measured in mAh,
the higher the mAh the more capacity the battery has. In addition some
batteries or battery containers (Mods) have built in microprocessors via which
the voltage and wattage can be manually selected. This allows greater
control over the vapour production of the device. As a rule the more Heavy
smokers should chose the more powerful variable voltage and wattage
batteries as they will create higher volumes of vapour and therefore be
more satisfying.
The atomiser: you can think of the atomiser as coil of
specialist wire, like the element of a kettle. The atomiser coil is wrapped
around a wick. The wick is designed to absorb the e-liquid and deliver it
to the coil. When the battery fires, it heats the atomiser coil which in
turn vapourises the available e-liquid on the wick. The vapour is then
inhaled via the drip tip.
The tank or clearomiser: this contains the reservoir of
e-liquid that is fed to the atomiser for vaporisation. The larger the tank,
the more e-liquid it can hold. Tanks are also known as clearomisers, and
most modern tank designs incorporate a dual coil atomiser, creating a
fuller more flavoursome vapour. All VaperVapour clearomisers allow the
atomiser coil to be replaced when it burns out. These are known as
re-buildable tanks or clearomisers. Because the dual coil atomiser can be
replaced it means that these clearomisers are far cheaper to use.

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