4500mAh External Backup Battery Charger Case for Samsung Galaxy S4 Black With Flip Cover * The powerful 4500mAh Li-polymer rechargeable battery can effectively provide 100%+ extra battery life to your Galaxy S4 * Protects your phone from scratches and other daily wear and tear * Environment-friendly Li-polymer Battery case is certified by FCC, CE, RoHS, so it is safe for you to use * LED indicator shows you how much it needs to charge with how many times it blinks