... Samsung Galaxy S3 i9300 USB Cradle with 2nd battery slot 1,Product Series:docking station desktop charger ... for Galaxy nexus i9300 with 2nd battery slot,2nd Battery cradle for i9300,usb charger,2,Features: ... (1)Data HotSync and battery charging on your desk with a cradle (2 ... )Support charging 2nd battery (3)Protection circuit (4)LED power indicator ( ...