I haven't done raw edge applique with batiks, but quilt with them more often than other fabrics...they don't ravel as much. I would think if I was doing raw edge, I'd prefer to use the batiks for that reason. The others always look so cute when they are made, but I didn't care for how they were after a couple of washes.
Do you have any that you can do up a sample with and wash a few times to see if you like the results?