Juul seems to have much smaller battery than vape "pens". It also does not produce nearly as much vapor. Their whole innovation is formaliting high concentratio

Juul seems to have much smaller battery than vape "pens". It also does not produce nearly as much vapor. Their whole innovation is formaliting high concentration juice which would not make you barf (using a different nicotine-derived compound than the pure nicotine in the original e-juice) so it could be used in a low power device.