Summary
You can turn on Battery Saver from Settings → Battery → Battery Saver (or from Quick Settings), which reduces background activity to extend battery life.
Steps
From Settings (recommended)
Open Settings
Tap Battery
Tap Battery Saver
Turn Use Battery Saver on
From Quick Settings (faster)
Swipe down from the top of the screen to open Quick Settings.
Tap Battery Saver to turn it on
Optional: Turn on automatically
Go to Settings → Battery → Battery Saver
Tap Set a schedule
Choose Based on routine or At a set percentage, then pick your preferred level (e.g., 15%)
Considerations
During charging: Battery Saver usually turns off automatically while plugged in
Very low battery: The phone may enable Battery Saver automatically even if you turned it off
After a reboot: Your chosen schedule remains, but manual on/off may reset
No Quick Settings tile visible: You may need to edit Quick Settings to add Battery Saver
Some background features may pause: Syncing, location updates, and notifications can be delayed
When to Contact Support
Create a support ticket if Battery Saver cannot be turned on in Settings or Quick Settings.
What to Collect for Support
Whether Battery Saver appears in Settings → Battery
Whether the Battery Saver tile appears in Quick Settings
Current battery percentage when trying to enable it
Whether the phone is plugged in while attempting to enable it
Sidephone OS version or date of last update