diff --git a/api/system-current.txt b/api/system-current.txt
index f69a99eafb9e5..0551c6c37be47 100755
--- a/api/system-current.txt
+++ b/api/system-current.txt
@@ -9733,6 +9733,7 @@ package android.telephony {
     field public static final int INVALID_EMERGENCY_NUMBER_DB_VERSION = -1; // 0xffffffff
     field public static final int KEY_TYPE_EPDG = 1; // 0x1
     field public static final int KEY_TYPE_WLAN = 2; // 0x2
+    field public static final String MODEM_ACTIVITY_RESULT_KEY = "controller_activity";
     field public static final long NETWORK_TYPE_BITMASK_1xRTT = 64L; // 0x40L
     field public static final long NETWORK_TYPE_BITMASK_CDMA = 8L; // 0x8L
     field public static final long NETWORK_TYPE_BITMASK_EDGE = 2L; // 0x2L
diff --git a/telephony/java/android/telephony/TelephonyManager.java b/telephony/java/android/telephony/TelephonyManager.java
index d5eb547958e02..6908ab8de4036 100644
--- a/telephony/java/android/telephony/TelephonyManager.java
+++ b/telephony/java/android/telephony/TelephonyManager.java
@@ -51,7 +51,6 @@ import android.net.ConnectivityManager;
 import android.net.NetworkStats;
 import android.net.Uri;
 import android.os.AsyncTask;
-import android.os.BatteryStats;
 import android.os.Binder;
 import android.os.Build;
 import android.os.Bundle;
@@ -163,8 +162,8 @@ public class TelephonyManager {
      * into the ResultReceiver Bundle.
      * @hide
      */
-    public static final String MODEM_ACTIVITY_RESULT_KEY =
-            BatteryStats.RESULT_RECEIVER_CONTROLLER_KEY;
+    @SystemApi
+    public static final String MODEM_ACTIVITY_RESULT_KEY = "controller_activity";
 
     /**
      * The process name of the Phone app as well as many other apps that use this process name, such
@@ -10058,7 +10057,8 @@ public class TelephonyManager {
      * Requests the modem activity info. The recipient will place the result
      * in `result`.
      * @param result The object on which the recipient will send the resulting
-     * {@link android.telephony.ModemActivityInfo} object.
+     * {@link android.telephony.ModemActivityInfo} object with key of
+     * {@link #MODEM_ACTIVITY_RESULT_KEY}.
      * @hide
      */
     @SystemApi