Never jump start your Zed or any other car with a cat converter (which is most cars now) as you will wreck the Cat
From experience, even when you have started your car, unless you are going on a long journey, put it on a trickle charge overnight
please tell why very interested, never heard this before.
When you jump start a car, a certain amount of unused fuel will go through the system and through to the Cat, covering the inside of it. When the car fires, hot fumes will go though to the Cat and ignite the unused fuel in the it. Your Cat is then wrecked
Not saying this is not right but i must of jumped 50 motors with cats & never had a problem , aa & rac jump hundreds a day , i would alls try & charge the battery rather than jump , jumps ok imo in a last resort , as said before by others neg to neg then live to flat live.