Samsung Galaxy SIII 4300mAh Extended Battery + Black Cover + Battery Charger w/ USB Output + Exclusive Black And Green Color Key Chain Kit (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 L710) Cell type: Lithium-ion Voltage: 3.7V Capacity: 4300mah Battery life will vary depending on your specific hardware and software configurations and network conditions. The smart led shows charging status