The Balanced Plasma Battery material in The First Descendant can be used to craft tons of different items when you farm it. However, this resource only seems to drop sparingly from very tough missions, making it a difficult item to collect. With recent updates to the game, there have been discoveries of areas and missions where you can gather these Batteries in larger quantities than before.
https://screenrant.com/the-first-descendant-how-to-farm-balanced-plasma-battery/