If your Playstation is left plugged into a socket and the power on the socket is switched on it will still charge your controllers even when the Playstation is shut down. The only time it won't charge is if you completely unplug the Playstation from the wall socket. Hope this helps.
Could I plug this in a usb charger, or would I have to leave the playstation on?
Good price but the reviews are not very convincing!!