diff --git a/api/current.xml b/api/current.xml
index d82e019f8156b..09a93787f0837 100644
--- a/api/current.xml
+++ b/api/current.xml
@@ -35104,6 +35104,17 @@
  visibility="public"
 >
 </field>
+<field name="ACTION_POWER_USAGE_SUMMARY"
+ type="java.lang.String"
+ transient="false"
+ volatile="false"
+ value="&quot;android.intent.action.POWER_USAGE_SUMMARY&quot;"
+ static="true"
+ final="true"
+ deprecated="not deprecated"
+ visibility="public"
+>
+</field>
 <field name="ACTION_PROVIDER_CHANGED"
  type="java.lang.String"
  transient="false"
diff --git a/core/java/android/content/Intent.java b/core/java/android/content/Intent.java
index 6fe2286edf0cc..33e769e54fcde 100644
--- a/core/java/android/content/Intent.java
+++ b/core/java/android/content/Intent.java
@@ -1076,6 +1076,15 @@ public class Intent implements Parcelable {
      */
     @SdkConstant(SdkConstantType.ACTIVITY_INTENT_ACTION)
     public static final String ACTION_APP_ERROR = "android.intent.action.APP_ERROR";
+
+    /**
+     * Activity Action: Show power usage information to the user.
+     * <p>Input: Nothing.
+     * <p>Output: Nothing.
+     */
+    @SdkConstant(SdkConstantType.ACTIVITY_INTENT_ACTION)
+    public static final String ACTION_POWER_USAGE_SUMMARY = "android.intent.action.POWER_USAGE_SUMMARY";
+    
     // ---------------------------------------------------------------------
     // ---------------------------------------------------------------------
     // Standard intent broadcast actions (see action variable).
diff --git a/core/res/res/values/strings.xml b/core/res/res/values/strings.xml
index 19fde5ccad0ae..fe3f76e27eb6b 100644
--- a/core/res/res/values/strings.xml
+++ b/core/res/res/values/strings.xml
@@ -1306,6 +1306,9 @@
     <string name="battery_low_percent_format">less than <xliff:g id="number">%d%%</xliff:g>
     remaining.</string>
 
+    <!-- When the battery is low, this is the label of the button to go to the
+         power usage activity to find out what drained the battery. -->
+    <string name="battery_low_why">Why?</string>
 
     <!-- Title of the alert when something went wrong in the factory test. -->
     <string name="factorytest_failed">Factory test failed</string>
diff --git a/services/java/com/android/server/status/StatusBarPolicy.java b/services/java/com/android/server/status/StatusBarPolicy.java
index b59fe545253ab..059dc7be3e0d3 100644
--- a/services/java/com/android/server/status/StatusBarPolicy.java
+++ b/services/java/com/android/server/status/StatusBarPolicy.java
@@ -707,6 +707,23 @@ public class StatusBarPolicy {
                 b.setView(v);
                 b.setIcon(android.R.drawable.ic_dialog_alert);
                 b.setPositiveButton(android.R.string.ok, null);
+                
+                final Intent intent = new Intent(Intent.ACTION_POWER_USAGE_SUMMARY);
+                intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK
+                        | Intent.FLAG_ACTIVITY_MULTIPLE_TASK
+                        | Intent.FLAG_ACTIVITY_EXCLUDE_FROM_RECENTS
+                        | Intent.FLAG_ACTIVITY_NO_HISTORY);
+                if (intent.resolveActivity(mContext.getPackageManager()) != null) {
+                    b.setNegativeButton(com.android.internal.R.string.battery_low_why,
+                            new DialogInterface.OnClickListener() {
+                        public void onClick(DialogInterface dialog, int which) {
+                            mContext.startActivity(intent);
+                            if (mLowBatteryDialog != null) {
+                                mLowBatteryDialog.dismiss();
+                            }
+                        }
+                    });
+                }
 
             AlertDialog d = b.create();
             d.setOnDismissListener(mLowBatteryListener);