Connected Battery Jumper Cables Wrong

[Xfaxman]

I understand your point Xfax, about preferred connection.

What I'm describing as a technique works equally well when your final connection is to a motor mount. Even at -40, if you solidly clamp your final connection to a motor mount with a reversed lead, you have created a huge explosion risk.

Rgds, D.

Yep, I agree, but the risk is greater if the last connection is to the discharged battery, where the hydrogen gas is.