Parts required
8 x 18650 batteries
USB circuit board module
Wires
2 x M5 screw

2 x square M5 nut

The M5 nuts are designed to be placed within the case, so pause the print to allow this.

Supports required for the lid to ensure dimensional accuracy for good fit with the case.

Batteries slide in from above, hot glue the board inside the lid, solder wire connections, slide lid into the case and secure with M5 screws.