[Lx]

I hope you don't think the NASA guy understood what he was looking at.

And you do, really?

[muawiyah]

I looked at the pictures. Matched them up with other pictures.

BTW, that's pretty trivial stuff when you've worked in on site reviews of condition and delivery for heavy duty electrical equipment for a major building full of thousands of machines and thousands of employees.

So, yeah, I know the difference between battery back up systems for the delicate electronic gear that controls mail sortation equipment, as well as the safety lights for emergency evacuation.

You may also recognize such things ~ I'm guessing the NASA guy is like one of those guys who breaks open the box with a crowbar and bops his screwdriver down the blocks just to see if stuff pops.

I bothered to spend a lot of time studying the technology behind large industrial scale batteries (and "things" used in place of batteries) just so I could do my job knowledgeably and safely.