What size battery do I need in order to run the SwayControl? Setec Customer Support December 17, 2021 01:20 The SwayControl requires a 12V battery system of greater or equal to 50Ahr. Related articles How do I remove the LED light on the SwayControl? Why is my SwayControl not showing any light indicators? What does the red and green light on my SwayControl mean? What types of brakes does the SwayControl work with? How long does the SwayControl stay active after being woken up by braking?