Yes, you can use this usb changer for PRS700. I'm now using iphone usb changer to charging my reader and i don't know how much time it take because i charging at night when i sleep. If you use the normal usb cable you can't read while charging but with this PSP cable
http://www.amazon.com/SEM-USBPD-BK-D...6682712&sr=8-4 you can read while charging.