Your controller has ever run out while you are playing a video game? KMD Battery Pack for Playstation4(r). This battery pack allows you to play for longer periods of time without worrying about the battery. It connects easily to the Playstation 4 controller. It's designed to be light to maintain the ergonomics of the controllers. Battery is available at all times via the top on/off buttons. 1000 mAh batteries significantly increase play time.