Doorbell synced to security light ring

My security lighting ring is synced to my doorbell ring. When my motion detector is activated the doorbell ring starts recording also. I also wired in a transformer and resistor so there's juice going to the the doorbell. The question I have is this: Why is the ring running low on juice? Shouldn't it continually be at full charge? At present I have to remove it from the wall and plug it into the house current. Anybody got anything? Oh yeah, there is juice at the doorbell from the transformer. 9vac. Thanks.