I agree with leaving the jumpers connected for a few minutes to try to build the dead battery up before trying to start.
That is if the person doing the jumping is willing to wait around for that to happen. Typically getting a jump, you are at the mercy of the person offering to help.
As for leaving the cables connected, never been a fan of that. I've had strange things start to happen, relays clicking, general confusion over the give and take. I get them off ASAP.
Now, there is a real danger of a surge when the cables are removed under certain conditions. One is if the reason it needed jumping was because one of the cables was not making connection with the battery, as in loose or corroded. The other would be if the battery had failed internally, an open connection so the battery was not there to take the charge when the engine started. Either case would be the same as disconnecting the battery when running.
Jump starting any vehicle should only be done in an emergency. Trying to bring up a discharged battery with the alternator can over heat the alternator or burn out a fuse or fuse link. Trying to jump a totally dead battery is asking for trouble.
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