eGo-C batteries, from Joyetech. The eGo-C batteries improve upon the last generation, with the inclusion of a built in power display. When the battery is between 100-50% capacity, the LED will shine White. When the battery reaches less than 50%, the LED will shine Light Blue, and finally Dark Blue, to indicate the battery is at 10% capacity, or less.
NOTE: All eGo batteries are guaranteed for 2 months. Please see out Terms and Conditions for more info.