Huawei P20
My phone's battery life is short
Solution 9 of 15: Notifications are turned on
When you turn on notifications, you will be notified about various events such as new email messages, messages from social networks and calendar appointments.
Press Settings.
Press Apps & notifications.
Press Notifications management.
Press the required app.
Press the indicator next to "Allow notifications" to turn on the function.
Press the Home key to return to the home screen.