One of my first designs a few years back. A 33140 LiFePo4 battery holder for 4 cells in series and 2 parallel. Designed in Tincercad.

It was printed on Creality Ender 3 V2 standard 0.4 nozzle and black Geeetech PLA.

Added side joiners to add a second holder to make a 4S4P Battery cell (12V). Joiner pins in separate file.