The Inspire 2 Intelligent Flight Battery Charging Hub is designed for use with the Matrice 200 Series and Inspire 2 Battery Chargers. This hub has the capacity to charge up to four Intelligent Flight Batteries at the same time! The battery pair with the most stored power will be charged first. This charging hub intelligently charges batteries in sequence according to battery power levels from high to low, if your batteries are not paired. To pair your batteries, use the DJI GO app. The Micro USB port on the hub is used for firmware updates.