Samsung Galaxy S4 Extended Battery, Kranich 7500mAh Extended Battery Replacement Full NFC Support with Black TPU Protection Case Kranich High Capacity 7500mAh battery that is manufactured by top grade Lithium Ion Cells materials. This Extended battery is larger than your original one and comes with a replacement TPU back cover to accommodate the bigger battery. Kranich battery has an integrated microchip to prevent overcharging and overheating that helps lengthen the life of your battery. The Specific TPU Back Case Cover that is fitting for easy on/easy off replacement and maintenance. Our extended batteries are designed to offer you about twice as much power with same usage as your original battery.