Doorbell dual, battery. Wired but draining

We have the dual camera battery doorbell, but wired. The app shows the battery @ 91% and charging but the charge level is decreasing by about 1% each day.

It just means that you are detecting more than the value that the batteries are getting charged. Either reduce the sensitivity of detections or decrease recording time and that will decrease the draw on the batteries. Eufy sizes their devices for an average of 10 detections a day for 30 seconds each. If you get more detections or record longer, it will draw more current than is being sent to the battery.