First congratulations for your both projects.
In a previous project you did use a “custom” battery. At this new project I think you are not using anymore. Can I ask you what is your feedback about that “custom” battery and why you did decided to not use anymore? I attached the image below.
I soldered and built a battery for long flight times out of 20 Panasonic 18650 cells. 4S5P, 17 000 mah, around 930gr. Should give 60 minutes of hovertime.