Eufy wired not charge battery

Hi all,

I install my eufy doorbell on my old doorbell.
So red and blue cable old bell out and on eufy.

All works fine but the bell doesnt charge. The battery drops every day.
Is the power to low? Or something other?

I see also not a cable

Anyone?

Hi,
There are several posts about this.
Do a search within this forum under Video Doorbell with the word “transformer” in the search field.