The C-rating indicates how quickly a battery can safely discharge its capacity. A higher C-rating means faster possible discharge rates. The formula is:
Maximum Current Draw = Capacity (in Ah) × C-rating
For example, a 2,000mAh (2Ah) battery with a 30C rating can safely deliver up to 60 amps (2 × 30). For most consumer drones, a 25C-50C rating is sufficient. Racing drones often require higher C-ratings (75C-100C) for rapid acceleration and aggressive maneuvers. Always ensure your battery's C-rating matches your drone's power requirements to prevent damage and maintain safe operation.