LS Accessories Samsung Galaxy S2 (I9100) and Samsung Galaxy Camera 1650 mAh Batteries (EB-F1A2GBU) (NOT compatible with Galaxy SII for AT&T, Galaxy SII for T-Mobile, Epic 4G Touch for Sprint)+ Free Charger with USB Port Batteries (EB-F1A2GBU) ONLY compatible with Samsung Galaxy S2 (I9100), NOT compatible with Samsung Galaxy S2 for AT&T, Samsung Galaxy S2 for T-Mobile, or Epic Touch 4G for Sprint 2 X 1650 mAh high quality Lithium Ion batteries that charges to its full capacity for over 500 cycles Grade A batteries with Dual IC protection to ensure safety; Battery Voltage: 3.7 Volts Battery Energy Content: 6.105 Watt Hours Universal Charger with USB Port that can charge your battery and cell phone at the same time Charger Input: 100-240V, 50/60HZ, 0.1A; Output: DC 4.2V, 300mA; USB Output: 5.2V 500mA