Understanding the Process: Jump Starting a Car Battery in Series or Parallel"

[NoTime]

Ah. I always wondered how/why they exploded. So they boil!

Melt and arcover.

Had one of the old style open ones explode from a spark from an arcwelder I was using about 15 feet away.
Quite a big bang, I got hit hard enough by bits of the case to leave a couple bruises and needed a shower.
The acid might have made the skin a little pink but no serious burns.

 

[Integral]

The Hydrogen gas released by a charging battery could be the source of an explosion. You need to be conscious of this release, but as mentioned up thread it seems to be a small chance.

When jump starting a car with a dead battery I do not start the car with the good battery. In the past I have seen diodes on the GOOD car get damaged. The problem would be the current draw of the starter, Diodes not not normally carry this current.

One good way to proceed is to connect the good car/battery to the dead car/battery then run the good car till the bad battery has enough charge to start the car. This is a bit slower but greatly reduces the chances of damage to either car.

 

[pivoxa15]

The Hydrogen gas released by a charging battery could be the source of an explosion. You need to be conscious of this release, but as mentioned up thread it seems to be a small chance.

When jump starting a car with a dead battery I do not start the car with the good battery. In the past I have seen diodes on the GOOD car get damaged. The problem would be the current draw of the starter, Diodes not not normally carry this current.

One good way to proceed is to connect the good car/battery to the dead car/battery then run the good car till the bad battery has enough charge to start the car. This is a bit slower but greatly reduces the chances of damage to either car.

What are the differences between the two choices?
So the first alternative is to connect a good battery with dead battery and let the good charge the bad. The second alternative is to do that except turn on the engine of the car which contains the good battery. Does the second imply the dead battery is charged by the motor of the car? But the new and dead battery are still connected so wouldn't the new battery charge the dead one as well?