diff --git a/src/com/android/settings/fuelgauge/BatteryBackupHelper.java b/src/com/android/settings/fuelgauge/BatteryBackupHelper.java
index eebfaf7d360..d35fc6483bf 100644
--- a/src/com/android/settings/fuelgauge/BatteryBackupHelper.java
+++ b/src/com/android/settings/fuelgauge/BatteryBackupHelper.java
@@ -37,6 +37,8 @@ import android.util.Log;
 
 import androidx.annotation.VisibleForTesting;
 
+import com.android.settingslib.fuelgauge.PowerAllowlistBackend;
+
 import java.io.IOException;
 import java.util.ArrayList;
 import java.util.Arrays;
@@ -63,6 +65,8 @@ public final class BatteryBackupHelper implements BackupHelper {
     static final String KEY_FULL_POWER_LIST = "full_power_list";
     static final String KEY_OPTIMIZATION_LIST = "optimization_mode_list";
 
+    @VisibleForTesting
+    PowerAllowlistBackend mPowerAllowlistBackend;
     @VisibleForTesting
     IDeviceIdleController mIDeviceIdleController;
     @VisibleForTesting
@@ -127,6 +131,7 @@ public final class BatteryBackupHelper implements BackupHelper {
             Log.w(TAG, "no data found in the getInstalledApplications()");
             return;
         }
+        int backupCount = 0;
         final StringBuilder builder = new StringBuilder();
         final AppOpsManager appOps = mContext.getSystemService(AppOpsManager.class);
         // Converts application into the AppUsageState.
@@ -136,20 +141,22 @@ public final class BatteryBackupHelper implements BackupHelper {
             @BatteryOptimizeUtils.OptimizationMode
             final int optimizationMode = BatteryOptimizeUtils.getAppOptimizationMode(
                     mode, allowlistedApps.contains(info.packageName));
-            // Ignores default optimized or unknown state.
+            // Ignores default optimized/unknown state or system/default apps.
             if (optimizationMode == BatteryOptimizeUtils.MODE_OPTIMIZED
-                    || optimizationMode == BatteryOptimizeUtils.MODE_UNKNOWN) {
+                    || optimizationMode == BatteryOptimizeUtils.MODE_UNKNOWN
+                    || isSystemOrDefaultApp(info.packageName)) {
                 continue;
             }
             final String packageOptimizeMode =
                     info.packageName + DELIMITER_MODE + optimizationMode;
             builder.append(packageOptimizeMode + DELIMITER);
             debugLog(packageOptimizeMode);
+            backupCount++;
         }
 
         writeBackupData(data, KEY_OPTIMIZATION_LIST, builder.toString());
-        Log.d(TAG, String.format("backup getInstalledApplications() size=%d in %d/ms",
-                applications.size(), (System.currentTimeMillis() - timestamp)));
+        Log.d(TAG, String.format("backup getInstalledApplications():%d count=%d in %d/ms",
+                applications.size(), backupCount, (System.currentTimeMillis() - timestamp)));
     }
 
     // Provides an opportunity to inject mock IDeviceIdleController for testing.
@@ -170,6 +177,20 @@ public final class BatteryBackupHelper implements BackupHelper {
         return mIPackageManager;
     }
 
+    private PowerAllowlistBackend getPowerAllowlistBackend() {
+        if (mPowerAllowlistBackend != null) {
+            return mPowerAllowlistBackend;
+        }
+        mPowerAllowlistBackend = PowerAllowlistBackend.getInstance(mContext);
+        return mPowerAllowlistBackend;
+    }
+
+    private boolean isSystemOrDefaultApp(String packageName) {
+        final PowerAllowlistBackend powerAllowlistBackend = getPowerAllowlistBackend();
+        return powerAllowlistBackend.isSysAllowlisted(packageName)
+                || powerAllowlistBackend.isDefaultActiveApp(packageName);
+    }
+
     private List<ApplicationInfo> getInstalledApplications() {
         final List<ApplicationInfo> applications = new ArrayList<>();
         final UserManager um = mContext.getSystemService(UserManager.class);
diff --git a/tests/robotests/src/com/android/settings/fuelgauge/BatteryBackupHelperTest.java b/tests/robotests/src/com/android/settings/fuelgauge/BatteryBackupHelperTest.java
index 90e9405ba03..f86d7a14e0e 100644
--- a/tests/robotests/src/com/android/settings/fuelgauge/BatteryBackupHelperTest.java
+++ b/tests/robotests/src/com/android/settings/fuelgauge/BatteryBackupHelperTest.java
@@ -40,6 +40,8 @@ import android.os.RemoteException;
 import android.os.UserHandle;
 import android.os.UserManager;
 
+import com.android.settingslib.fuelgauge.PowerAllowlistBackend;
+
 import java.util.Arrays;
 import java.util.List;
 
@@ -59,6 +61,9 @@ import org.robolectric.annotation.Resetter;
 @RunWith(RobolectricTestRunner.class)
 @Config(shadows = {BatteryBackupHelperTest.ShadowUserHandle.class})
 public final class BatteryBackupHelperTest {
+    private static final String PACKAGE_NAME1 = "com.android.testing.1";
+    private static final String PACKAGE_NAME2 = "com.android.testing.2";
+    private static final String PACKAGE_NAME3 = "com.android.testing.3";
 
     private Context mContext;
     private BatteryBackupHelper mBatteryBackupHelper;
@@ -73,6 +78,8 @@ public final class BatteryBackupHelperTest {
     private AppOpsManager mAppOpsManager;
     @Mock
     private UserManager mUserManager;
+    @Mock
+    private PowerAllowlistBackend mPowerAllowlistBackend;
 
     @Before
     public void setUp() {
@@ -84,6 +91,7 @@ public final class BatteryBackupHelperTest {
         mBatteryBackupHelper = new BatteryBackupHelper(mContext);
         mBatteryBackupHelper.mIDeviceIdleController = mDeviceController;
         mBatteryBackupHelper.mIPackageManager = mIPackageManager;
+        mBatteryBackupHelper.mPowerAllowlistBackend = mPowerAllowlistBackend;
     }
 
     @After
@@ -172,16 +180,49 @@ public final class BatteryBackupHelperTest {
 
     @Test
     public void backupOptimizationMode_backupOptimizationMode() throws Exception {
-        final String packageName1 = "com.android.testing.1";
-        final String packageName2 = "com.android.testing.2";
-        final String packageName3 = "com.android.testing.3";
-        final List<String> allowlistedApps = Arrays.asList(packageName1);
-        createTestingData(packageName1, packageName2, packageName3);
+        final List<String> allowlistedApps = Arrays.asList(PACKAGE_NAME1);
+        createTestingData(PACKAGE_NAME1, PACKAGE_NAME2, PACKAGE_NAME3);
 
         mBatteryBackupHelper.backupOptimizationMode(mBackupDataOutput, allowlistedApps);
 
         // 2 for UNRESTRICTED mode and 1 for RESTRICTED mode.
-        final String expectedResult = packageName1 + "|2," + packageName2 + "|1,";
+        final String expectedResult = PACKAGE_NAME1 + "|2," + PACKAGE_NAME2 + "|1,";
+        verifyBackupData(expectedResult);
+    }
+
+    @Test
+    public void backupOptimizationMode_backupOptimizationModeAndIgnoreSystemApp()
+            throws Exception {
+        final List<String> allowlistedApps = Arrays.asList(PACKAGE_NAME1);
+        createTestingData(PACKAGE_NAME1, PACKAGE_NAME2, PACKAGE_NAME3);
+        // Sets "com.android.testing.1" as system app.
+        doReturn(true).when(mPowerAllowlistBackend).isSysAllowlisted(PACKAGE_NAME1);
+        doReturn(false).when(mPowerAllowlistBackend).isDefaultActiveApp(anyString());
+
+        mBatteryBackupHelper.backupOptimizationMode(mBackupDataOutput, allowlistedApps);
+
+        // "com.android.testing.2" for RESTRICTED mode.
+        final String expectedResult = PACKAGE_NAME2 + "|1,";
+        verifyBackupData(expectedResult);
+    }
+
+    @Test
+    public void backupOptimizationMode_backupOptimizationModeAndIgnoreDefaultApp()
+            throws Exception {
+        final List<String> allowlistedApps = Arrays.asList(PACKAGE_NAME1);
+        createTestingData(PACKAGE_NAME1, PACKAGE_NAME2, PACKAGE_NAME3);
+        // Sets "com.android.testing.1" as device default app.
+        doReturn(true).when(mPowerAllowlistBackend).isDefaultActiveApp(PACKAGE_NAME1);
+        doReturn(false).when(mPowerAllowlistBackend).isSysAllowlisted(anyString());
+
+        mBatteryBackupHelper.backupOptimizationMode(mBackupDataOutput, allowlistedApps);
+
+        // "com.android.testing.2" for RESTRICTED mode.
+        final String expectedResult = PACKAGE_NAME2 + "|1,";
+        verifyBackupData(expectedResult);
+    }
+
+    private void verifyBackupData(String expectedResult) throws Exception {
         final byte[] expectedBytes = expectedResult.getBytes();
         verify(mBackupDataOutput).writeEntityHeader(
                 BatteryBackupHelper.KEY_OPTIMIZATION_LIST, expectedBytes.length);