But there are still only two ways to connect the four clamps, since cable color doesn't matter when they're acting purely as cables.

On the other hand more science knowledge is required to be sure of which way they go. "Does '+' go with the other '+'? Wait, no. It's like magnets, the plus goes with the minus... Oh damn. Why is it doing that?" People are less likely to be in doubt when they have a box with wires saying "attach to positive", "attach to negative".