There are many mounts for batteries available but not any that had exactly what I was looking for.  The model is designed such that it does not “lock” into the mount.  I use it in my workshop next to the chargers, so I'm not concerned about it being knocked out.  It also has 2 holes designed to use either a basic sheetrock screw or a torq head deck screw – both of which many people have laying around.  

I've also included a .stp file into my upload to allow any user to make edits to it easier than a .stl file.

I have tested this with a 1.5Ah battery as shown in the image and at present this is holding a 60v 9Ah battery on the wall with a confident fit.

Printed with a generic PLA+ bought on Amazon that was likely the cheapest on the day I bought it on a Prusa MINI (2021 model).