Mugen Power Extended Battery with Battery Cover for Samsung Galaxy Note AT&T i717, Black 5400mAh, 3.7V power rating; Lithium-ion technology Provides more tha 100% additional capacity over the standard battery Comes with a Black color extended battery cover door that accommodates the extended battery and features a built-in kickstand Keeps your phone charged and ready to go, even with heavy phone and data usage Compatible with Samsung Galaxy Note (AT&T) i717 / SGH-i717