EC TECHNOLOGY&reg; 2 x 1800mAh Li-ion Battery For Samsung Galaxy S I9000 GT-I9000, Samsung Captivate SGH-I897, Samsung Epic 4G SPH-D700, Samsung Vibrant SGH-T959, 1 x Free Travel Charger Type: Li - ion battery; Voltage: 3.7V. Capacity: 1800mAh, more than 504 charge cycles Compatible with Samsung Galaxy S I9000/GT-I9000,Samsung Captivate SGH-I897,Samsung Epic 4G SPH-D700 package:2xbattery&1Xcharger Charger: output: 4.2V/600mA, USB output 5V/600mA, multi-purpose, multi-connector.