clock has to be regularly reset - secondary battery somewhere?

My 11yo Roomba 770 works great, and is very repairable, except the clock has to be reset pretty much every time it gets used.

I assume there is a secondary battery somewhere in the bot that has died and needs to be replaced, but the internet (including iRobot’s generally excellent support) has been unhelpful in pointing me at one. Anyone here have ideas?

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