Simple holder for 3 LR44 batteries.
Needs 9.5mm x 9mm metal battery contacts.
Design file https://cad.onshape.com/documents/7fb189363dbc79fb1798d551/w/a06afb54e2682136ff3cdf51/e/5f0cd6c05f1c2cb165a714ac
The author marked this model as their own original creation.