Batpack kit with Joye ECO D16 Atomizer is the first vape kit compatible with AA battery in the world. Joyetech has been strategically working with the certification body Underwriters Laboratory(UL) to help develop the testing procedures for the new 8139 battery safety certification. And now, Joyetech Batpack integrates ECO TECHNOLOGY and operated from dual AA batteries source to bring you safer power source. New ECO Technology provides the best vaping experience but allows battery to have a very low output, that means battery life by almost double. Coming with compact size, Joyetech Batpack is also good for high nicotine e-liquid. Combined with ECO D16 Atomizer, you can enjoy amazing vaping experience. 6 different colors for you to choose.