A jump starter is different to a battery charger. A jump starter would be similar to using a battery. With a batter charger, using it to embed wire into foundation is shorting it out, therefore the safety switch will instantly activate. A battery doesn’t have a safety switch, so I’m assuming a jump starter doesn’t either.
I used to carry a fully charged jump starter in my boat as a back up. What a waste of time that was. It didn’t do anything to start my 7.3 litre diesel engine.