Eufy 2k battery doorbell now hard wired

I have just wired up my battery doorbell to my old door bell connections. The connections give me 13.81v but the battery is not showing charging. Is this correct or am I still going to have to charge it through the USB like i have been.

Seems pointless supplying the wires when it falls within the criteria for wired charging only ro find out it is not charging.

For me it has been a little iffy. I tried with two doorbell transformers. I have a small waterproof box outside and I had to take them out of their casing to fit.

I’m using this one EVOBT15/1 230V/4-8-12V. I think 15VA is more correct as the bare minimum. Right now i have heavy traffic on the street, lots of construction, so I can’t go full blast, I must allow it to stop recording when it sees no motion (so no 2 minute recordings). But if I do it like that it keeps battery at a 80-90% level.