BLU Electronic Cigarette Batteries Come In Either White Or Black With A Brilliant Blue Light At The End.blu batteries are the latest in Lithium Ion technology. Designed for long-lasting life, each battery has a metal twist attachment at one end for easy screw-on assembly. At the other end of the battery is the blu light, which emits a brilliant glow whenever you inhale, providing a unique experience. The light also acts as an alert system, letting you know when your battery needs to be recharged. Each starter kit comes with two batteries, available in either black or white.

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