The device's battery life can be calculated based on the battery capacity and rated voltage. For example, the power consumption of the transmitting mode of the Pyro 5 4K is <16.5W, and the power consumption of the receiving mode is <14W. The battery capacity of our NP-F970 is 6000mAh and the rated voltage is 7.4V. Then 6000x7.4÷1000=44.4Wh. The fully charged NPF970 battery can last for about 2~3 hours. Take this as a reference.