riotact
don't pitch, learn to hit
No, you can not warm up with it. The on-deck batter must have either a legal softball bat, a legal warm-up bat, or any combination of the two.
A bat filled with sand is NOT a legal softball bat. How does the sand get in there and stay there? The bat is altered in some fashion (usually drilling and then plugging), and how are we to know that this alteration will hold up?
There's one team I know of that has taken an old metal bat, drilled a hole where the end cap would be, filled it with sand or concrete, then used a BOLT to plug the hole! And somehow, they fail to see how this is dangerous!
If I have a bat, that looks exactly like an old approved bat, your telling me the average umpire is going to tell me to put it away?? Your killing me. No ump in the world will catch that, when 50% of them don't even know the Synergy2 and Freak100 are banned in ASA.
There is no penalty for "warmup" devices anways, just a warning is my guess