An electronic cigarette is composed of a battery and a cartomizer. The most common type of ecigarette battery that you will see people using in public is the ‘stick’ battery. These batteries are skinny and of all the kinds of electronic cigarettes, look most similar to an analog (especially white ones) – when compared to ‘mods’. Each stick battery has one end that is threaded and screws onto a cartomizer. The other end has one of three options: ash cap, stealth, or diamond.