If a noise sensor is battery-powered, then we'll show the battery icon:  https://www.figma.com/file/WTdzEh4CudGdQFOtuVR3Eh/Thermostat%2FNoise-components?type=design&node-id=2828-17361&mode=design&t=lNiIgZId5Vk2GYvv-0