Control picture:

Warning, the following pictures contain graphic violence against melons.
First hit, diagonally, left hand, light-medium strength.

Second hit, vertically, left hand, light-medium strength.

Third hit, vertically, left hand, light-medium strength.

Fourth hit, vertically, left hand, light-medium strength.

For those that have never used one, the ball tip opens a hole and the follow-through with the baton length allows it to cut through almost like a sword. I realize that the human skull is more durable than a small watermelon, but it was as close as I could do. There is no damage to the baton, but I did wrap it in a thin plastic bag to keep the melon juice off of it.
Baton - $30.
Watermelon - $3.
Feasting on the blood of your enemies - priceless.
If you'd like me to make more tests, I've got another melon and can get a couple more tomorrow. Possible weapons to test are my Glock 78 Field Knife or my display Khukri. I have plenty of crappy display swords that could be used, but I know what we've all said about those used in a zombie role.