EC TECHNOLOGY 2 x 2300mAh Li-ion Battery for Samsung Galaxy Nexus Samsung I515, AT&T Samsung Galaxy S2 II Skyrocket Samsung SGH-I727, T-mobile Samsung Galaxy S2 II Samsung T989, Telus Samsung Galaxy S2 II X Samsung T989D, Sprint Samsung Galaxy Nexus SPH-L700, Google Galaxy Nexus, Nexus Prime Without NFC/ Google Wallet (Not Compatible With Samsung Galaxy Nexus I9250, Not Compatible With Galaxy S2 I9100) + Free Multi-purpose USB Travel Charger Type: Li - ion battery; Voltage: 3.7V. Capacity: 2300mAh, more than 500 charge cycles Compatible with various devices: Verizon Samsung Galaxy Nexus Samsung I515, AT&T Samsung Galaxy S2 II Skyrocket Samsung SGH-I727 Multi-functional charger allows for the charging of two batteries simultaneously; Indicator shows the current charging state (red for charging; blue for fully charged) Charger output: 4.2V 600mA, USB output: 5V 600mA package:2xbattery&1Xcharger