Huawei WATCH 2 Faq page 6

In the Wear OS by Google app, enter the Advanced Settings menu and
then touch Watch battery to check detailed battery statistics.
Under Settings > APPs, choose the power-intensive third-party apps, and
then click Uninstall or Disable.
2. Use the watch's Smart power saving mode.
Press the watch's upper right key (power key) to access the app list, touch
and open the Battery app, then select Smart power saving mode.
3. Block notification messages.
After the watch receives a notification message, press and hold the screen
and select Block all notifications to block all further notification messages
from this app. Alternatively, go to the , enter
Wear OS by Google app
the Notifications menu, then select the apps you no longer want to receive
messages from under .4. Use the watch's Airplane
Block app notifications
mode.
If you find yourself not needing a network connection (for example, when
you are on a plane, asleep, or exercising for extended periods), switch the
watch to Airplane mode. To enable Airplane mode, pull down the shortcut
menu and touch the airplane icon.
5. Disable the Always-on screen setting.
Go to Settings > Display, and disable Always-on screen.