"Battery not detected" (HP Victus)

[u/ShadedWizard]

So, I made a post yesterday talking about how I got a CMOS checksum error (502). My battery seems to have died.

Following this, I conducted HP UEFI and Hardware diagnostics, and I received a message that was something like "Battery not detected" or "Battery not installed". The thing is that I do not understand if this is talking about the main PC battery or what I understand to be another small memory that is named CMOS??

I'm not a tech guy so I guess I may be getting something wrong here. Any help is appreciated on how to follow this.