diff --git a/app/src/main/java/uk/org/openseizuredetector/MainActivity.java b/app/src/main/java/uk/org/openseizuredetector/MainActivity.java
index ab42708..31cb6fe 100644
--- a/app/src/main/java/uk/org/openseizuredetector/MainActivity.java
+++ b/app/src/main/java/uk/org/openseizuredetector/MainActivity.java
@@ -701,7 +701,9 @@ public class MainActivity extends AppCompatActivity {
                         tv.setTextColor(warnTextColour);
                     }
                     tv = (TextView) findViewById(R.id.battTv);
-                    tv.setText(getString(R.string.WatchBatteryEquals) + String.valueOf(mConnection.mSdServer.mSdData.batteryPc) + "%");
+                    tv.setText(getString(R.string.WatchBatteryEquals)
+                            + String.valueOf(mConnection.mSdServer.mSdData.batteryPc) + "% / "
+                            +String.valueOf(mConnection.mSdServer.mSdData.phoneBatteryPc)+"%");
                     if (mConnection.mSdServer.mSdData.batteryPc <= 10) {
                         tv.setBackgroundColor(alarmColour);
                         tv.setTextColor(alarmTextColour);
diff --git a/app/src/main/java/uk/org/openseizuredetector/SdData.java b/app/src/main/java/uk/org/openseizuredetector/SdData.java
index cc850c5..74ab37e 100644
--- a/app/src/main/java/uk/org/openseizuredetector/SdData.java
+++ b/app/src/main/java/uk/org/openseizuredetector/SdData.java
@@ -64,7 +64,8 @@ public class SdData implements Parcelable {
     public long alarmTime;
     public long alarmThresh;
     public long alarmRatioThresh;
-    public long batteryPc;
+    public long batteryPc;  // watch battery
+    public int phoneBatteryPc;
 
     /* Heart Rate Alarm Settings */
     public boolean mHRAlarmActive = false;
@@ -269,6 +270,7 @@ public class SdData implements Parcelable {
                 jsonObj.put("dataTime", "00-00-00 00:00:00");
             }
             jsonObj.put("batteryPc", batteryPc);
+            jsonObj.put("phoneBatteryPc", phoneBatteryPc);
             jsonObj.put("alarmState", alarmState);
             jsonObj.put("alarmPhrase", alarmPhrase);
             jsonObj.put("sdMode", mSdMode);
@@ -330,6 +332,7 @@ public class SdData implements Parcelable {
             jsonObj.put("specPower", specPower);
             jsonObj.put("roiPower", roiPower);
             jsonObj.put("batteryPc", batteryPc);
+            jsonObj.put("phoneBatteryPc", phoneBatteryPc);
             jsonObj.put("watchConnected", watchConnected);
             jsonObj.put("watchAppRunning", watchAppRunning);
             jsonObj.put("haveSettings", haveSettings);
diff --git a/app/src/main/java/uk/org/openseizuredetector/SdDataSource.java b/app/src/main/java/uk/org/openseizuredetector/SdDataSource.java
index dbeec10..2aed61f 100644
--- a/app/src/main/java/uk/org/openseizuredetector/SdDataSource.java
+++ b/app/src/main/java/uk/org/openseizuredetector/SdDataSource.java
@@ -26,8 +26,10 @@ package uk.org.openseizuredetector;
 import android.content.BroadcastReceiver;
 import android.content.Context;
 import android.content.Intent;
+import android.content.IntentFilter;
 import android.content.SharedPreferences;
 import android.net.Uri;
+import android.os.BatteryManager;
 import android.os.Handler;
 import android.preference.PreferenceManager;
 import android.text.format.Time;
@@ -359,6 +361,7 @@ public abstract class SdDataSource {
                 mSamplePeriod = (short) dataObject.getInt("analysisPeriod");
                 mSampleFreq = (short) dataObject.getInt("sampleFreq");
                 mSdData.batteryPc = (short) dataObject.getInt("battery");
+
                 Log.v(TAG, "updateFromJSON - mSamplePeriod=" + mSamplePeriod + " mSampleFreq=" + mSampleFreq);
                 mUtil.writeToSysLogFile("SDDataSource.updateFromJSON - Settings Received");
                 mUtil.writeToSysLogFile("    * mSamplePeriod=" + mSamplePeriod + " mSampleFreq=" + mSampleFreq);
@@ -404,6 +407,19 @@ public abstract class SdDataSource {
         return (retVal);
     }
 
+    private int getPhoneBatteryLevel() {
+        /* Returns the current phone battery level in percent */
+        // Check phone battery level
+        int batPc;
+        IntentFilter ifilter = new IntentFilter(Intent.ACTION_BATTERY_CHANGED);
+        Intent batteryStatus = mContext.registerReceiver(null, ifilter);
+        int level = batteryStatus.getIntExtra(BatteryManager.EXTRA_LEVEL, -1);
+        int scale = batteryStatus.getIntExtra(BatteryManager.EXTRA_SCALE, -1);
+        batPc = (int) (level * 100 / (float) scale);
+        Log.v(TAG, "SdDataSource.getPhoneBatteryLevel - Phone Bat = " + level + ", scale=" + scale + ", phoneBatteryPc=" + batPc);
+        return batPc;
+    }
+
     /**
      * Calculate the magnitude of entry i in the fft array fft
      *
@@ -426,6 +442,8 @@ public abstract class SdDataSource {
         int nMax = 0;
         int nFreqCutoff = 0;
         double[] fft = null;
+        // Update phone battery level - it is done here so it is called for all data sources.
+        mSdData.phoneBatteryPc = getPhoneBatteryLevel();
         try {
             // FIXME - Use specified sampleFreq, not this hard coded one
             mSampleFreq = 25;
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index 3797d8f..efb9fc3 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -55,7 +55,7 @@
     <string name="HRAlarmOff">HR Alarm OFF</string>
     <string name="WatchAppOK">Watch App OK</string>
     <string name="WatchAppNotRunning">Watch App NOT Running</string>
-    <string name="WatchBatteryEquals">Watch Battery = </string>
+    <string name="WatchBatteryEquals">Batteries = </string>
     <string name="PowerEquals">Power = </string>
     <string name="SpectrumRatioEquals">Spectrum Ratio = </string>
     <string name="Threshold">threshold</string>