RAD Power Radcity Ebike Battery holder for Rack or Wall

I bought Sue a second battery for her Rad Power Radcity Step-thru 3 (2021) eBike. I needed some way to attach it to the bike. I designed and 3D printed an adapter that mounts to the rear bike rack to hold the battery. You can lock the battery to the rack. You can also use the adapter as a wall mount to hold the battery during charging