The Airtonk Power 7.4V 8C 4000mAh LiPo Battery is designed to provide reliable power for various RC transmitters, including models like Spektrum DX9, DX8, DX7, DX6E, and compatible RadioMaster and FRsky transmitters. With a capacity of 4000mAh and an 8C continuous discharge rate, it ensures extended operation times, making it ideal for long flying sessions. The battery's lightweight design and high-quality construction offer both portability and durability.