Portable Charging Station. Features: High-capacity mobile charging station that's great for traveling. Charges up to three batteries for up to 48 minutes of flight time. USB port provides power to mobile devices such as smartphones and tablets. Adjusts charging current automatically according to temperature. Convenient for storing the aircraft and batteries when not charging. Compatible Battery Charger: Spark Battery Charger (F1C50 Version 2). Compatible Battery Model: MB1-1480mAh-11.4V.