That's just the typical sounds of a battery with not even nearly enough power to start engine.
Trickle charger it for at least 1 day. Don't get impatient and try before that. So NOT let your X5s alternator do the heavy lifting or you will be buying another alternator soon.

Sent from my Pixel 3 using Tapatalk

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I swear, my cars are like a girlfriend.
Sometimes its a rough ride, sometimes its smooth motorin'.
Sometimes she doesnt like how i treat her and sometimes i dont like how she behaves.
BUT at the end of the day, she loves it when I am inside her.

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'91 850i
'05 X5 4.4i
'09 Clubman S