How do I know if the optional Battery Backup (service kit 179573) is connected to my valve? How will I know when the batteries need to be changed?

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When the optional Battery Backup in service kit 179573 is installed, a white battery indicator in the upper right hand corner of the display will appear under normal use when the valve is running on AC power. In the event of a power outage, this indicator will appear when the shower in on. A red outline of the battery indicator indicates the batteries need to be changed.