[Scott Douglas]

...or tried to this morning and got nothing. Power button lit up for a second and nothing happened. Nada, zip, zero.

This after I got a message yesterday that I posted in another thread complaining about the OS. I won't pollute that one further, just this one.

When I bought this particular computer, I bought two of them I liked the configuration so much. Got one for my wife too but she's since moved on to a Dell. So, I got her old box out of the garage where it'd been sitting on my work bench waiting for a day such as today.
I decided to open hers up to see how hard it would be to get to the system battery. Not much of a problem as long as you remember to reconnect the HD cable that you moved enough to unplug without knowing it. That mystery solved I went on to my computer.
Put a battery I've had sitting around for I don't know how long, and got another message about the battery possibly being dead. It finally booted on the third or fourth try.
So I guess I should go get some fresh batteries for both boxes.

How do motherboards keep these batteries charged up?
Do they perform a charging function when the computer is running?
These boxes were built in May of 2018 so not all that old relatively speaking compared to some of my other boxes which never needed the system battery to be replaced.