[4550mAh Tested Capacity] Gorilla Gadgets 4500mAh Extended Life Battery for Samsung Galaxy S3 with NFC + Marble White Back Cover [Compatible with Samsung Galaxy S III GT-i9300, AT&T Samsung Galaxy S3 Samsung i747, Verizon Samsung Galaxy S3 Samsung i535, T-mobile Samsung Galaxy S3 Samsung T999, U.S. Cellular Samsung Galaxy S3 R530, and Sprint Samsung Galaxy S3 Samsung L710] Delivers 4550mAh out of claimed 4500mAh (Refer battery capacity testing chart in product photos for details) Highest tested S3 extended battery capacity (Refer battery capacity testing chart in product photos for details) Near Field Communication (NFC) Technology Enabled Made from high quality Li-Ion cells and replacement back cover Compatible with Samsung Galaxy S3 from all major US carriers