Most of the electronic cigarettes are electronically powered through stored electric energy. The energy is stored in a lithium battery which is rechargeable. The electronic cigarette reviews are a good source of information when you want to know about the battery life of your electronic cigarette and how long your stored energy is supposed to last.

The battery and its housing or casing is the largest component found on an electronic cigarette. The battery unit may have an electronic sensor which detects airflow for any operations which are automated. If the battery unit lacks the automated sensor then it might have a button which is used manually to start any operation.

The battery casing may also contain a switch which cuts off the power or the energy coming from the battery so as to prevent any overheating. An LED light might also be incorporated into the battery unit. The light might be colored or normal.