Versa 4 won't work unless it's connected to the charger

[Mnofal]

when I remove the charger the watch turn of

Moderator Edit: Clarified subject

[Guy_]

Hi @Mnofal - this may be normal, press the button and pull down on the watch face to get to Quick Settings and turn off all the icons.

There you can also see the charge level. Wait till it is 100% charged before unplugging the cable.

You may need to restart the watch also by holding the watch button for 10 seconds till it blanks or vibrates and wait for the logo to appear and for it to start.

If pressing the button when not on the charge cable doesn't wake the watch it may have a fault.

You can always chat via the Fitbit App, Help & support section, Contact Customer support. They can eventually help you with a factory reset to see if it is a permanent fault.