Or a new cat.
It can be difficult to find a good path to ground around the engine of modern cars. Something attached directly to the engine block should be good. Many jumper packs can barely start a car, so a poor connection to ground won’t help. And I assume the OP grounded the black cable to the car, not the earth, which is isolated. I’ve seen many more cases of jumper packs and cables needing to be put on the battery terminals, than exploding batteries (0 for explosions). It might help to have manufacturers include jumping points away from the battery.
Second hand info:
Battery can’t hurt you, no nuff voltage.
So nicks each hand so blood is there.
Grabbed a good 6 volt battery.
Went to his funeral.
Volts only matter if current can flow.
Let’s all be careful out there now…
Ouch. Bloodrocuted.
One of the mechanics had hooked a set of cables up to a spare battery, and snapped the clamps onto my hand whilst I was under a hood. Hurt like a bitch - And I don’t just mean the clamps.
Now that you mention it, though, yeah, the clamps drew blood.
In my case it was someone who didn’t understand the words RED is POSITIVE. the single arc that ensued evaporated a marble size piece of the terminal.
Thanks for the replies.
Fortunately my friend isn’t the malicious sort and gave me good advice this morning.