Most get the high capacity extended batteries.Didn't they get the big batteries to cover their 12 hour shifts? I remember reading that somewhere. I know there are 3x12s and 4x10 schedules among others.
Though some stick to the smaller battery.
It is easier to shove one in your gear pocket when it is smaller for fire but draw back is change out will be sooner specially if you TX a lot.
Some smaller shorter police prefer the short one, mainly the small female officers where i am.
I dont recall the capacity as I haven't bothered to pull mine out in while.