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mike[_22_]

On 11/26/2015 8:54 PM, wrote:

With reverse polarity protection you don't get 12.2 volts open
circuit. You get NOTHING. If you have a battery charger putting out
12.2 volts open circuit, it won't put out more into a load.

Well, that may be the way you would have designed it.
But, you probably didn't design it.

I don't have a problem with assumptions that you verify.
I have a problem with people who state, with certainty,
stuff they have not experienced on unspecified equipment
in unknown circumstances.

Doesn't it trouble you the least little bit that it's
12.2V? What's the failure mode that results in that
open circuit voltage reading?

Like I said - not rocket science

Good thing that rocket scientists don't think they KNOW everything.

If you understand batteries and electricity you don't have to know
everything to be sure of many things.

Yep, I used to manage very bright engineers with similar arrogance.
Spent much of my time cleaning up after them.

Let's just save the thread the excruciating protracted attempts
to prove how smart you are and turn it into a thought experiment.

Take a random car battery charger.
Plug it into your oscilloscope with no other load.
What would you expect to see on the screen?

Take your random DC voltmeter and think about how it would
respond to what you see on the screen.

I agree that understanding of electricity would help...;-)