So, the Stun baton is a junk item. It deals basically no damage, and it doesn't function properly. It just clutters up the police spawns immensely. There are police stations that are simply overflowing with stun batons.
You will say - But it needs a battery!
Batteries are helluva rare and I'd rather use them in a Rangefinder or a scope. Besides, the Stun baton only offers 1 stun hit per battery.
It is easily solvable - make the regular baton (which was leaked in the files about a year ago) spawn instead - which would be much more appropriate.