MV4 - weird behaviour

[Hackcell]

Hello,

I have a 4 slot MVS using unibios. Today I realized that the calendar / time does not move unless the machine is on. Even just plugged the time/date does not advance.
Battery seems to be OK as all settings are properly stored, so it is quite confusing.

Any idea on what to check will be highly appreciated.

Thank you.

 

[Kujako]

Got pictures of the battery area? I'd start there, look for damaged traces or other issues.