This battery mount is made to be attached to the underside of a 6 inch hatch lid or bigger. This allows you to run power supplies for lights, cameras and sounders and have it easily removable while you are loading and unloading to keep the weight down. By having the mount suspended off the base of the kayak it keeps the connections dry and reliable! This is designed to fit a 4.5 or 5ah battery. Work extremely well with the Viking 6 in Hatch.