Earlier quoted context omitted.
I too have a need to keep old computers online and it's frustrating when the CMOS battery dies and all those super important motherboard settings that make it boot from a hard drive in the first place are lost, over and over on every reboot. Not everyone knows that old computers do not necessarily boot from the hard drive by default.
Why not just replace the CMOS battery so you only have to do it once every 4th blue moon vs everytime the thing reboots?
The CMOS batteries, themselves, have a shelf life and for whatever reason, we probably had none of the specific size required on hand. Being that the device was on battery backup in a rack, it probably led to the engineer thinking "it'll never be rebooted, a label will do"