On Thursday, 13 June 2019 11:29:34 UTC+1, Woody wrote:

Looks like a bit of non-understanding panic here. Since when has it been
possible to get a shock off 12V - for which these connectors are intended?

Well, I'll never forget connecting a 9v battery across my brace as a kid and whilst not a 'shock' per se it was most definitely something of a unwanted surprise having spit boil in my mouth. Using crocodile clips didn't help with the swift removal either! :-)