Electro Cigarettes batteries use the latest in Lithium lon technology.  They are designed to last for a long time, they are easy to screw to your Electro Cartomizer giving an easy assembly.  The Electro battery glows at the end when you inhale, it als acts as an alert system which tells you when the battery needs to be recharged.  Our Electro batteries come with either a blue LED or a red LED.  All Electro starter kits come with two batteries one red and one blue.