Good friggen question.

You need a pigtail from the battery manufacturer that plugs into the battery and has positive and negative cables on the other end. These go to the heavy gauge red and black cables on the controller.

There are 3 terminals on the battery picture you shared. you need to know which ones are positive and which ones are negative (not sure why there are three - I have seen some batteries that have 2 positive and one negative lead).

You need that pigtail or a schematic...