I have a 1500V electric fly swatter - the type you can get at £1 stores and on Amazon - it looks like a small tennis racket but it has 2AA batteries to kill insects. I would like to take it with me from the UK to France. My guess would be that it loosely falls under "electro shock weapons" and can't be taken on board. I say loosely because I doubt something with 2AA batteries could do serious damage to a person.
Yes, it sounds stupid. However, every time I go to France I get bitten by mosquitos and this would be a very convenient and satisfying way of dealing with the problem.
I'd be happy to put it in hold luggage and/or take out the batteries.