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 package com.example.androidbatterypercentage;

import android.os.BatteryManager;
import android.os.Bundle;
import android.app.Activity;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.view.Menu;
import android.widget.TextView;

public class MainActivity extends Activity {
 private TextView batteryPercent;
  private void getBatteryPercentage() {
  BroadcastReceiver batteryLevelReceiver = new BroadcastReceiver() {
         public void onReceive(Context context, Intent intent) {
             context.unregisterReceiver(this);
             int currentLevel = intent.getIntExtra(BatteryManager.EXTRA_LEVEL, -1);
             int scale = intent.getIntExtra(BatteryManager.EXTRA_SCALE, -1);
             int level = -1;
             if (currentLevel >= 0 && scale > 0) {
                 level = (currentLevel * 100) / scale;
             }
             batteryPercent.setText("Battery Level Remaining: " + level + "%");
         }
     }; 
     IntentFilter batteryLevelFilter = new IntentFilter(Intent.ACTION_BATTERY_CHANGED);
     registerReceiver(batteryLevelReceiver, batteryLevelFilter);
  }
 
   /* @Override*/
    protected void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_main);
         batteryPercent = (TextView) this.findViewById(R.id.batteryLevel);
         getBatteryPercentage();
    }

//    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.activity_main, menu);
        return true;
    }
    
}

توضیحاتش توی این لینک هست: Android battery level in percentage/Numbers Example

این لینک هم میتونه مفید باشه: Get battery level and state in Android

* توی manifest نیازی به تعریف مجوز نیست