C-rating indicates a battery's maximum continuous discharge rate. The formula is:
Maximum Current = Capacity (in Ah) × C-rating
For example, a 2000mAh (2Ah) battery with a 20C rating can deliver: 2 × 20 = 40 amps continuously. Higher C-ratings are crucial for:
However, higher C-ratings often mean shorter flight times and battery life. Photography drones typically use batteries with lower C-ratings (10-20C) as they prioritize steady, longer flight times over rapid power delivery.