Smart Cell NFC Enabled 5200mAh extended battery for Samsung Galaxy S 4 IV i9500 + Black cover Smart, Sleek Construction - built to OEM standards World Class, Grade A Lithium Ion Cells - almost doubles your talk, text, and browse time Charge-Stop Safeguards with Integrated Smart Microchip - provides built-in overload/overcharge protection & improved run time Capacity: 5200mAh; Extended Back Cover Color: Black Guaranteed to fit: Samsung Galaxy S4; i337 AT&T; L720 Sprint; M919 T-Mobile; R970 US Cellular; i545 Verizon