The batterysaver can be turned on automatically when a certain battery percentage is reached. It turns off some device features and restricts apps from using up too much battery.

Android 9
Step 1:  Open the  settings
Step 2:  Tap on  Battery
Step 3:  Tap on  Battery saver
Step 4:  Activate or deactivate  Battery saver
  1. Open the settings
  2. Tap on Battery
  3. Tap on Battery saver
  4. Activate or deactivate Battery saver

Android Instructions
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