Mini "G" Enclosure (X2 18650)

Sized down version of a Hammond 1590G aluminum enclosure. Scaled down to fit X2 18650 batteries side by side. With flat top batteries you should be able to run both parallel and series wiring with both negative clips on the bottom. With button-top batteries you may be only limited to parallel setup.

Link to clips- https://www.digikey.com/product-detail/en/keystone-electronics/204/36-204-ND/227461

https://www.digikey.com/product-detail/en/keystone-electronics/238/36-238-ND/303809