YESOO NFC [ 2x 5200mAh ] Extended Battery and [BLACK] Back Cover + Wall Travel Battery Charger For Samsung Galaxy S4 SIV i9500 Capacity: 5200mAh (Class 10 - High Quality / NFC) Voltage: 3.7V Cell type: Lithium-ion Technology This Battery Is Equipped With An NFC Antenna Excellent quality at a great price.