I also want to know this information.
I need to install an Edge 530 on my ebike to control it, using Edge as the ebike display and control unit as per ANT+ LEV profile.
But I need to DIY a fixed power connection to Edge and make if quick and simple to attach the Edge so the same connection to the original battery pack.
I wish the technical information for powering the Edge on the back pins could be available so I could 3D print a support that could include a develop electronic board wired to ebike power wires: 52V.