LOL, CMOS batteries. That's quite a blast from the past.
For the less tech-literate people here, CMOS is a small memory chip that stores your BIOS settings, including system clock, and needs a constant flow of very small amount of electricity to maintain. A common way PC builders used to reset BIOS settings was to remove the CMOS battery and put it back in.
So yeah, once the battery dies, you lose your BIOS settings and your console can't boot up properly. Digital or physical games, doesn't matter, you're bricked. Usually you have the option to reset to factory settings, but as long as the battery is dead, it won't remember those settings and you'll have to do it again the next time you boot it up. The wiped system clock is trickier to solve, but syncing with an online server usually fixes that. Again, once you turn off the console, however, you'll have to sync your clock all over again. The only way to fix this permanently is to replace the CMOS battery.
These days, BIOS settings are usually stored in Flash memory, which doesn't need a battery to maintain, so the CMOS is very much an obsolete tech.
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