The Premium Bronze EGO battery is a great addition to any master vaper’s collection. Its sparkling metallic color shimmers with hits of copper and tin. Don’t worry though, this Bronze battery won’t oxidize and will stand the test of time. Our Premium EGO battery lasts well over 800 puffs on just one charge; that's four times the battery life of your traditional Ecigarette. Our Premium EGO batteries are exclusively designed to fit our cartomizers, the first of any EGO in the industry to be compatible with cartomizers! The EGO batteries are .5" in diameter, 3.5" long without a cartomizer attached, and slightly heavier than your traditional Ecigarette. All of our EGO batteries have a newly developed rubberized matte finish, making them easy to grip, smooth, and comfortable in your hand.