Water damage of Solar Floodlight after rains

My ring solar floodlight stopped working. Upon inspection and dismounting it my husband could hear water. He disassemble the device and it was filled up with water. The battery, battery bay and all the electrical terminals are rusted. It is obvious the gasket ring wasn't protecting the equipment because it allowed rain water in. Please advice on what to do? We are drying the whole thing... Anyone with the same problem please advice.