Battery type: Li-ion; Voltage: 3.7V; Capacity: 2200mAh * Uses selected Top 10% Grade A cells to ensure longer battery life and charge cycles; More than 500 recharge cycles over the life of the battery. Built-in circuit protection; Certified by CE / FCC / RoHS * 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. The charger can charge more than 90% cell phones * Compatible with various devices: Samsung Galaxy S2 T989(T-mobile )/ SGH-I727( AT&T )/I515(Verizon)/Telus Samsung Galaxy S2 II X T989D/SPH-L700S(Sprint), Without NFC/Google Wallet...(full list below) * 24 x 7 email support, 8-hr x 5-weekday call support, 18-month hassle-free warranty, Shipping same or next business day