Samsung Galaxy On Max User Manual page 17

Basics
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Tap APPLY.
After entering maximum power saving mode, on the Home screen, tap
to use. To remove apps, tap → Edit and select an app with
To deactivate maximum power saving mode, tap → Turn off Maximum power saving
mode.
The estimated battery usage time may vary depending on your device settings and
operating conditions.
Planning battery consumption
Manage your battery consumption by setting how the device will utilise your device's
remaining battery power.
The following features may not be available depending on the region or service
provider.
Reserve battery mode
Save the battery power by reserving it for calls and messages. In reserve battery mode, you
can use only the Phone and Messages apps.
To use reserve battery power mode, Launch the Settings app and tap Device maintenance
→ Battery → Reserve battery for calls, and then tap the switch to activate it. Then, drag the
bar to set the amount of battery power reserved for calls and messages. When your battery
power reaches the preset level, the device will alert you and activate reserve battery mode.
To deactivate reserve battery mode, tap the switch.
Extending the battery life
Extend the battery life by automatically activating ultra power saving mode when the battery
reaches a certain percentage.
Launch the Settings app and tap Device maintenance → Battery → Extend battery time,
tap the switch to activate it, and then select a level.
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and select an app