Seidio BACY45SSGS4-BK Innocell 4500mAh Extended Life Battery for Samsung Galaxy S4 - Retail Packaging - Black Comes with a black replacement door featuring Seidio's signature soft touch coating Keeps your phone charged and ready to go, even with heavy phone and data usage Capacity: 4500mAh To obtain the full capacity of your Seidio battery, we recommend that you leave the battery/your phone on the charger for 2-3 hours after the indicator turns green or the battery status shows full. For use with Samsung GALAXY S4