Ring spotlight camera doesn't recognize the battery even after reset

I have an older ring spotlight camera. After some heavy rain, I charged my batteries but the camera doesn't recognize the fully loaded batteries anymore. I am getting this red light in the battery compartment. The batteries are fully charged and I even tried a brand new charged battery. I already did the reset and all this but nothing seems to help. I also have the camera already since over a week in the house in case there is moisture in it from the rain. I am trying to get help or somewhere instructions how to take the camera apart. There is no warranty on this camera anymore but it would be a shame to lose it. I have a total of 6 cameras for different locations and never had a problem like this.