DJI Matrice 4 Series Charging Hub is designed for use with Matrice 4 Intelligent Flight Batteries. It can charge up to four Intelligent Flight Batteries in sequence from high to low power level. The battery charging hub supports both Standard Mode and Ready-to-Fly Mode. Standard Mode charges each battery to 100% sequentially. Ready-to-Fly Mode charges each battery to 90% sequentially and maintains that level for quick deployment.