The Spark Portable Charging Station is designed to wirelessly charge up to three Spark Intelligent Flight Batteries on the go. Safe and intelligent with an impressive total power of 5000 mAh, the Charging Station charges up to three Spark batteries in 2.5 hours when fully charged. It also provides power to mobile devices via its USB port, and the Charging Station itself charges in just 1 hour and 35 minutes. To charge Spark with a battery inserted, just put the aircraft on the charging contact in the Charging Station. Battery slots on either side of the Charging Station let you charge up to two additional batteries. When charging, the Charging Station will first charge the battery in the aircraft and then any extra batteries according to their power levels from highest to lowest.