Battery sizes


New member
I have a 2200mah 3s, 800mah 3s, and a couple of 500mah 3s lipos. The planes I am building are the various FT designs. What I am wondering, being on a budget, is what would be another good size, or sized, to add to my packs next. I want to focus on what will have the most diversity for these builds and in a 3 cell. Would a 1300mah fit the bill, or is another size more widely usable?