No, the curve stays the same no matter how many batteries you use. What is showing what each cell is doing under load. If you add more cells you will increase the overall voltage but the drop under load will remain the same. If you use two separate packs then you have in effect reduced the load by 1/2 so now the cells will only see a 2 amp load, and will follow the 2 amp curve, etc. The smallest batteries I use are rated for 4 amp constant and around 10 amps peek.