I have a spider, VC#, up-to-date firmware, etc.
I sett the realtimeclock.
I disconnected the USB cable for a few seconds
After power up, the realtime clock is zero.
I found some references to “described in the ebook” I read the ebook and other materials in the turorials, but found no reference to installing or checking the realtime clock battery.
I did find some references to batteries for other boards.