Apple Watch 3 won't start up past Apple logo after battery replacement

Hi Team,

I just replaced the battery of my Apple Watch folloing this iFixit guide with the iFixit battery replacement kit.

Before sealing the watch, I tried to restart it to no avail. I placed it on the charging pod and it displayed the “snake screen”, meaning I guess the battery was completely empty. I let it charge for a couple of hours, but I can’t get it starting again.

Just pressing the side button doesn’t do anything.

Doing a force restart pushing both the side button and the digital crown for 10 seconds does indeed bring up the apple logo , but after that nothing happens. The logo stays on for some time (varying between on minute to more than 10 minutes) than it disappears….

I tried to disconnect and reconnect the battery, to no avail.

Is there anything I can do to bring this watch bach to life ?

Thnx a lot fort your help !