1.Fully Compatible: replacement batteries of sony np-fw50, compatible with sony nex 3/5/7 series, slt-a series and alpha series (see description for all compatible models)--If you have any other doubt before order, please contact us and we are willing to serve you 2.High Capacity & Qualit: premium cells create quality batteries. charge 2 batteries at the same time without any conflict because of the sufficient 5V / 2A input. Beneficial from the sufficient 5V / 2A input, rapid charge is available. Fully charged within 60 - 90 minutes, no worry about missing awesome photos and videos. 2000mah high capacity bring you longer video recording and more photo shoot 3.Rapid Dual Charge: rapidly charge 2 batteries simultaneously from any usb power source. built-in top quality A-Class lithium ion battery, safer to use. Multiple smart protection system keeps your devices safe from over-charging, over-voltage, over-current and short circuit,Chip automatic protection function