21700 x 4 frame set for TRX-4 battery

thingiverse

To create a high-capacity rechargeable battery for the TRX-4, you'll need to combine top and bottom parts along with middle components to achieve a 2S configuration. Alternatively, you can arrange the cells in a 4S setup, depending on how you connect them. You will require four high-current 21700 cells. By using 4000mAh, 40A cells, you can assemble an 8000mAh, 80A, 2S battery. To integrate all components into one unit, you'll need to install x4 3.5mm spacers.