diff --git a/packages/SettingsLib/aconfig/settingslib.aconfig b/packages/SettingsLib/aconfig/settingslib.aconfig
index 38c871c..403e219 100644
--- a/packages/SettingsLib/aconfig/settingslib.aconfig
+++ b/packages/SettingsLib/aconfig/settingslib.aconfig
@@ -102,3 +102,13 @@
         purpose: PURPOSE_BUGFIX
     }
 }
+
+flag {
+    name: "extreme_power_low_state_vulnerability"
+    namespace: "pixel_energizer"
+    description: "the battery saver can pause all non-essential apps and their corresponding notification when device is in locked state to introduce the security vulnerability"
+    bug: "346513692"
+    metadata {
+      purpose: PURPOSE_BUGFIX
+    }
+}
diff --git a/packages/SettingsLib/src/com/android/settingslib/fuelgauge/BatterySaverUtils.java b/packages/SettingsLib/src/com/android/settingslib/fuelgauge/BatterySaverUtils.java
index 8bdbee3..9be3159 100644
--- a/packages/SettingsLib/src/com/android/settingslib/fuelgauge/BatterySaverUtils.java
+++ b/packages/SettingsLib/src/com/android/settingslib/fuelgauge/BatterySaverUtils.java
@@ -16,11 +16,15 @@
 
 package com.android.settingslib.fuelgauge;
 
+import static android.provider.Settings.Secure.EXTRA_LOW_POWER_WARNING_ACKNOWLEDGED;
+import static android.provider.Settings.Secure.LOW_POWER_WARNING_ACKNOWLEDGED;
+
 import static com.android.settingslib.fuelgauge.BatterySaverLogging.ACTION_SAVER_STATE_MANUAL_UPDATE;
 import static com.android.settingslib.fuelgauge.BatterySaverLogging.EXTRA_POWER_SAVE_MODE_MANUAL_ENABLED;
 import static com.android.settingslib.fuelgauge.BatterySaverLogging.EXTRA_POWER_SAVE_MODE_MANUAL_ENABLED_REASON;
 import static com.android.settingslib.fuelgauge.BatterySaverLogging.SaverManualEnabledReason;
 
+import android.app.KeyguardManager;
 import android.content.ContentResolver;
 import android.content.Context;
 import android.content.Intent;
@@ -33,6 +37,10 @@
 import android.util.Log;
 import android.util.Slog;
 
+import androidx.core.util.Function;
+
+import com.android.settingslib.flags.Flags;
+
 /**
  * Utilities related to battery saver.
  */
@@ -125,6 +133,19 @@
             Log.d(TAG, "Battery saver turning " + (enable ? "ON" : "OFF") + ", reason: " + reason);
         }
         final ContentResolver cr = context.getContentResolver();
+        final PowerManager powerManager = context.getSystemService(PowerManager.class);
+
+        if (Flags.extremePowerLowStateVulnerability()) {
+            var keyguardManager = context.getSystemService(KeyguardManager.class);
+            if (enable
+                    && needFirstTimeWarning
+                    && keyguardManager != null
+                    && keyguardManager.isDeviceLocked()) {
+                var result = powerManager.setPowerSaveModeEnabled(true);
+                Log.d(TAG, "Device is locked, setPowerSaveModeEnabled by default. " + result);
+                return result;
+            }
+        }
 
         final Bundle confirmationExtras = new Bundle(1);
         confirmationExtras.putBoolean(EXTRA_CONFIRM_TEXT_ONLY, false);
@@ -136,7 +157,7 @@
             setBatterySaverConfirmationAcknowledged(context);
         }
 
-        if (context.getSystemService(PowerManager.class).setPowerSaveModeEnabled(enable)) {
+        if (powerManager.setPowerSaveModeEnabled(enable)) {
             if (enable) {
                 final int count =
                         Secure.getInt(cr, Secure.LOW_POWER_MANUAL_ACTIVATION_COUNT, 0) + 1;
@@ -173,10 +194,7 @@
      * @see #EXTRA_POWER_SAVE_MODE_TRIGGER_LEVEL
      */
     public static boolean maybeShowBatterySaverConfirmation(Context context, Bundle extras) {
-        if (Secure.getInt(context.getContentResolver(),
-                Secure.LOW_POWER_WARNING_ACKNOWLEDGED, 0) != 0
-                && Secure.getInt(context.getContentResolver(),
-                Secure.EXTRA_LOW_POWER_WARNING_ACKNOWLEDGED, 0) != 0) {
+        if (isBatterySaverConfirmationHasBeenShowedBefore(context)) {
             // Already shown.
             return false;
         }
@@ -184,6 +202,17 @@
         return true;
     }
 
+    /**
+     * Returns {@code true} if the battery saver confirmation warning has been acknowledged by the
+     * user in the past before.
+     */
+    public static boolean isBatterySaverConfirmationHasBeenShowedBefore(Context context) {
+        Function<String, Integer> secureGetInt =
+                key -> Secure.getInt(context.getContentResolver(), key, /* def= */ 0);
+        return secureGetInt.apply(LOW_POWER_WARNING_ACKNOWLEDGED) != 0
+                && secureGetInt.apply(EXTRA_LOW_POWER_WARNING_ACKNOWLEDGED) != 0;
+    }
+
     private static void recordBatterySaverEnabledReason(Context context, boolean enable,
             @SaverManualEnabledReason int reason) {
         final Bundle enabledReasonExtras = new Bundle(2);
diff --git a/packages/SettingsLib/tests/robotests/src/com/android/settingslib/fuelgauge/BatterySaverUtilsTest.java b/packages/SettingsLib/tests/robotests/src/com/android/settingslib/fuelgauge/BatterySaverUtilsTest.java
index 80301c0..b143b22 100644
--- a/packages/SettingsLib/tests/robotests/src/com/android/settingslib/fuelgauge/BatterySaverUtilsTest.java
+++ b/packages/SettingsLib/tests/robotests/src/com/android/settingslib/fuelgauge/BatterySaverUtilsTest.java
@@ -28,23 +28,31 @@
 import static org.junit.Assert.assertEquals;
 import static org.mockito.ArgumentMatchers.anyBoolean;
 import static org.mockito.ArgumentMatchers.eq;
+import static org.mockito.Mockito.mock;
 import static org.mockito.Mockito.times;
 import static org.mockito.Mockito.verify;
 import static org.mockito.Mockito.when;
 
+import android.app.KeyguardManager;
 import android.content.ContentResolver;
 import android.content.Context;
 import android.content.Intent;
 import android.os.PowerManager;
+import android.platform.test.annotations.EnableFlags;
+import android.platform.test.flag.junit.SetFlagsRule;
 import android.provider.Settings.Global;
 import android.provider.Settings.Secure;
 
+import com.android.settingslib.flags.Flags;
+
 import org.junit.Before;
+import org.junit.Rule;
 import org.junit.Test;
 import org.junit.runner.RunWith;
 import org.mockito.ArgumentCaptor;
 import org.mockito.Mock;
-import org.mockito.MockitoAnnotations;
+import org.mockito.junit.MockitoJUnit;
+import org.mockito.junit.MockitoRule;
 import org.robolectric.RobolectricTestRunner;
 
 import java.util.List;
@@ -54,26 +62,22 @@
     private static final int BATTERY_SAVER_THRESHOLD_1 = 15;
     private static final int BATTERY_SAVER_THRESHOLD_2 = 20;
 
-    @Mock
-    private Context mMockContext;
+    @Rule(order = 0) public final SetFlagsRule mSetFlagsRule = new SetFlagsRule();
+    @Rule(order = 1) public final MockitoRule mMockitoRule = MockitoJUnit.rule();
 
-    @Mock
-    private ContentResolver mMockResolver;
-
-    @Mock
-    private PowerManager mMockPowerManager;
+    @Mock private Context mMockContext;
+    @Mock private ContentResolver mMockResolver;
+    @Mock private PowerManager mMockPowerManager;
 
     @Before
     public void setUp() throws Exception {
-        MockitoAnnotations.initMocks(this);
-
         when(mMockContext.getContentResolver()).thenReturn(mMockResolver);
         when(mMockContext.getSystemService(eq(PowerManager.class))).thenReturn(mMockPowerManager);
         when(mMockPowerManager.setPowerSaveModeEnabled(anyBoolean())).thenReturn(true);
     }
 
     @Test
-    public void testSetPowerSaveMode_enableWithWarning_firstCall_needConfirmationWarning() {
+    public void setPowerSaveMode_enableWithWarning_firstCall_needConfirmationWarning() {
         Secure.putString(mMockResolver, Secure.LOW_POWER_WARNING_ACKNOWLEDGED, "null");
         Secure.putString(mMockResolver, Secure.EXTRA_LOW_POWER_WARNING_ACKNOWLEDGED, "null");
         Secure.putString(mMockResolver, Secure.LOW_POWER_MANUAL_ACTIVATION_COUNT, "null");
@@ -96,7 +100,7 @@
     }
 
     @Test
-    public void testSetPowerSaveMode_enableWithWarning_secondCall_expectUpdateIntent() {
+    public void setPowerSaveMode_enableWithWarning_secondCall_expectUpdateIntent() {
         // Already acked.
         Secure.putInt(mMockResolver, Secure.LOW_POWER_WARNING_ACKNOWLEDGED, 1);
         Secure.putInt(mMockResolver, Secure.EXTRA_LOW_POWER_WARNING_ACKNOWLEDGED, 1);
@@ -119,7 +123,7 @@
     }
 
     @Test
-    public void testSetPowerSaveMode_enableWithWarning_thirdCall_expectUpdateIntent() {
+    public void setPowerSaveMode_enableWithWarning_thirdCall_expectUpdateIntent() {
         // Already acked.
         Secure.putInt(mMockResolver, Secure.LOW_POWER_WARNING_ACKNOWLEDGED, 1);
         Secure.putInt(mMockResolver, Secure.EXTRA_LOW_POWER_WARNING_ACKNOWLEDGED, 1);
@@ -142,7 +146,7 @@
     }
 
     @Test
-    public void testSetPowerSaveMode_enableWithWarning_5thCall_needAutoSuggestionWarning() {
+    public void setPowerSaveMode_enableWithWarning_5thCall_needAutoSuggestionWarning() {
         // Already acked.
         Secure.putInt(mMockResolver, Secure.LOW_POWER_WARNING_ACKNOWLEDGED, 1);
         Secure.putInt(mMockResolver, Secure.EXTRA_LOW_POWER_WARNING_ACKNOWLEDGED, 1);
@@ -166,7 +170,7 @@
     }
 
     @Test
-    public void testSetPowerSaveMode_enableWithoutWarning_expectUpdateIntent() {
+    public void setPowerSaveMode_enableWithoutWarning_expectUpdateIntent() {
         Secure.putString(mMockResolver, Secure.LOW_POWER_WARNING_ACKNOWLEDGED, "null");
         Secure.putString(mMockResolver, Secure.EXTRA_LOW_POWER_WARNING_ACKNOWLEDGED, "null");
         Secure.putString(mMockResolver, Secure.LOW_POWER_MANUAL_ACTIVATION_COUNT, "null");
@@ -187,17 +191,17 @@
     }
 
     @Test
-    public void testSetPowerSaveMode_disableWithoutWarning_expectUpdateIntent() {
+    public void setPowerSaveMode_disableWithoutWarning_expectUpdateIntent() {
         verifyDisablePowerSaveMode(/* needFirstTimeWarning= */ false);
     }
 
     @Test
-    public void testSetPowerSaveMode_disableWithWarning_expectUpdateIntent() {
+    public void setPowerSaveMode_disableWithWarning_expectUpdateIntent() {
         verifyDisablePowerSaveMode(/* needFirstTimeWarning= */ true);
     }
 
     @Test
-    public void testEnsureAutoBatterysaver_setNewPositiveValue_doNotOverwrite() {
+    public void ensureAutoBatterysaver_setNewPositiveValue_doNotOverwrite() {
         Global.putInt(mMockResolver, Global.LOW_POWER_MODE_TRIGGER_LEVEL, 0);
 
         BatterySaverUtils.ensureAutoBatterySaver(mMockContext, BATTERY_SAVER_THRESHOLD_1);
@@ -212,7 +216,7 @@
     }
 
     @Test
-    public void testSetAutoBatterySaverTriggerLevel_setSuppressSuggestion() {
+    public void setAutoBatterySaverTriggerLevel_setSuppressSuggestion() {
         Global.putString(mMockResolver, Global.LOW_POWER_MODE_TRIGGER_LEVEL, "null");
         Secure.putString(mMockResolver, Secure.SUPPRESS_AUTO_BATTERY_SAVER_SUGGESTION, "null");
 
@@ -230,7 +234,7 @@
     }
 
     @Test
-    public void testGetBatterySaverScheduleKey_returnExpectedKey() {
+    public void getBatterySaverScheduleKey_returnExpectedKey() {
         Global.putInt(mMockResolver, Global.LOW_POWER_MODE_TRIGGER_LEVEL, 0);
         Global.putInt(mMockResolver, Global.AUTOMATIC_POWER_SAVE_MODE,
                 PowerManager.POWER_SAVE_MODE_TRIGGER_PERCENTAGE);
@@ -253,8 +257,25 @@
                 KEY_NO_SCHEDULE);
     }
 
+    @EnableFlags(Flags.FLAG_EXTREME_POWER_LOW_STATE_VULNERABILITY)
     @Test
-    public void testSetBatterySaverScheduleMode_setSchedule() {
+    public void setPowerSaveMode_1stTimeAndDeviceLocked_enableBatterySaver() {
+        var keyguardManager = mock(KeyguardManager.class);
+        when(mMockContext.getSystemService(KeyguardManager.class)).thenReturn(keyguardManager);
+        when(keyguardManager.isDeviceLocked()).thenReturn(true);
+        when(mMockPowerManager.setPowerSaveModeEnabled(true)).thenReturn(true);
+
+        var enableResult = BatterySaverUtils.setPowerSaveMode(
+                mMockContext,
+                /* enable= */ true,
+                /* needFirstTimeWarning= */ true,
+                /* reason= */ 0);
+
+        assertThat(enableResult).isTrue();
+    }
+
+    @Test
+    public void setBatterySaverScheduleMode_setSchedule() {
         BatterySaverUtils.setBatterySaverScheduleMode(mMockContext, KEY_NO_SCHEDULE, -1);
 
         assertThat(Global.getInt(mMockResolver, Global.AUTOMATIC_POWER_SAVE_MODE, -1))