No matter how low you set your screen brightness, you almost always have to charge your iPhone 5 at least once a day. That’s incredibly inconvenient, especially for people on-the-go all day long. This case has an internal Rechargeable battery that doubles the battery life of your iPhone 5 increasing the autonomy of your device anywhere. Adding this additional 2200 mAh battery case now, you will never run out of battery.Please notice that this one is special for travel user when they are on the car or on the way.