This is a DCB115 mount for Multiboard. Requires two "13mm Big Thread, Flat Head bolts" to mount through the mounting holes.
Printed with 3 walls, 20% infill, and supports enabled for the tops of the mounting holes. Feels very sturdy and holds charger tight. Can slide batteries in and out without any movement of the charger.
The source model is published onshape (here) for remixing.
The author marked this model as their own original creation.