Generally with more battens it is easier to make a stable sail, but it will also add weight. The battens for a sort of skeleton. Roughly speaking more battens can also give a stiffer sail, but this is not an absolute rule. Maybe you remember the Hot Sails Maui SO sails from a few years back. It was one of the softest wave sails around, yet had six battens ell the way down to the 3.5 size.
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