The Freefly SL Battery Charger is designed to charge FREEFLY SL4-Ground and SL8-Air batteries and can charge a computer or mobile device as well. It will charge an SL4 in 70 minutes or an SL8 in 2.5 hours via a proprietary port, and it features a USB-C port which doubles as both an input and output to supply power to your compatible battery or charge a personal device with a connected battery.