Spotlight Camera Battery

For some time one of my Ring Spotlight Battery Cameras only intermittently “acknowledges” on the app on my phone that it has a second fully charged battery on standby. Instead it “says” add a battery. I have tried different batteries in the camera to no avail. Sometimes it shows 2 batteries in place, but is currently warning that one battery needs charging and is “ignoring” the second fully charged battery already in place. I have deleted the Ring app, logged on and off and hard reset my iPhone. Nothing works. Help. Julie