Yes it rarely used as a singular charge, more a hybrid charge to do with things like - criminal stabs 7-11 clerk, now the 'dangerous weapon' charge is added along with the stabbing.
No, it cannot discharge current. The vital component that's missing is power pack. Without a battery compartment, its is just a capacitor, transformer, and not capable of anything. In order to function it must be assembled to it's full length.
That's how I see it too. Now if you alter the design so it can be discharged at a length less than that prescribed, then it would be a prohibited device.




















































