battery drain

There is no problem with Apple Watch and Battery drain.

There can be problems withn your software or your usage...

Make sure to turn off background app refresh and check walkie talkie is not accidentally turned on.

Make sure you have no VPN or VPN based ad-blocker. Uninstall it then remove any profiles (iPhone Settings, General VPN & Device Management)

Force restart your watch i.e. press and hold both the side button and Digital Crown for at least 10 seconds, then release both buttons when you see the Apple logo.

Then while the Watch is restarting Force Restart the paired iphone   Force restart iPhone – Apple Support (UK)

Try it for a couple of days especially if you sync photos to your Watch.

Then if still no better you can check for damaged or self-discharging battery...

How to check your Apple Watch battery fo… - Apple Community

If the battery seems OK then Unpair the watch and then pair it again.

Unpair and erase your Apple Watch – Apple Support (UK)

Set up your Apple Watch – Apple Support (UK)

More info

Apple Watch - Battery - Apple (UK)

Batteries - Maximising Performance - Apple (UK)

Then if still no better you can check for damaged or self-discharging battery... 

How to check your Apple Watch battery fo… - Apple Community

 If it still discharges after all the above Watch resets try this user tip

Apple Watch battery drain - the ultimate … - Apple Community