Ring Doorbell 3 solar power not charging

Hi I have fitted a spotlight camera with solar power and a ring doorbell 3 with solar power. The spotlight camera is great and working. When the sun is out I get a image of a sun on the battery and shows its charging. However on the doorbell the battery is slowly being depleted. The solar panel is showing as connected in the health settings but it doesn't show the charging or sun logo like on the spotlight cam is this normal? Thanks in advance ps see the image attached