Click sound on charging

Hello,

Someone gave me a Nintendo Switch to fix it.

What I’ve already done:

After unmounting it I found that the battery was dead (0V) so I ordered and mounted a new one.

But it was not working: battery at 2.8V so I suppose not enough to boot.

Then I tested the charger: 0V on the out of USB C on the Switch board!

So I borrowed one to test if it was really the charger or the connector.

The problem:

Now my problem is that when I plug in the cable I can hear a little regular clicking noise I think coming from the M92T36. It’s like a spark sound.

I don’t know if it’s normal, I dare not leave plugged in for fear of killing the battery / charger.

If someone can confirm me that I can leave the charger plugged in,

Thank you,

Emerick