qx7 battery tray 3x 18650

This is for accst qx7 that can handle 3s voltage. New acces qx7 is only rated to handle 2s volatage so do not put 3 cells for new access qx7.

The metal springs to hold the batteries are from more industrial holder like this https://www.reichelt.com/at/en/battery-holder-for-2x-18650-halter-mpd8-p213342.html?&trstct=pos_0&nbc=1