Phone overheating after connecting battery replacement

I followed the instructions to replace the battery for a iPhone XR. The phone wouldn't turn on anymore even when charging for a long time so I suspected it was the battery.

When I connect the new battery to the board the phone is making a buzzing noise and the components near the connector are getting hot. When I connect the old battery nothing happens.

Could it be another issue then the old battery which caused the phone to not turn on anymore? Maybe the old battery didn't charge anymore because if this and now when I connect the new battery everything is powered again and the real issues surfaces?