Can someone explain to me why they don’t recommend putting car jumper cables on the working battery black terminal to the dead battery black terminal but rather to an unpainted metal surface on the donor car?

Question

Also, how does electricity flow from one car to the other if there isn’t a loop?

In: 26

Answer 1

It’s more of a tradition now. The old timey batteries that had fill holes where you could top off the acid level would leak a lot of hydrogen gas.