Sound when starting engine.

[Yan]

Hi all.
Ford Fiesta 2013

I have a strange sound when starting the engine, it can last from 10 seconds to 40.
The sound is present when I turn on the engine, not only when it is cold, but every time.
Does anyone recognize this sound?

https://youtube.com/shorts/6HrEsWPYDpQ?feature=share

(This may be a coincidence, but my car accumulator died on the day the sound appeared. I replaced it already.)

 

[Handy Andy]

Something electronic is making that sound - almost like a beacon