What is the purpose of the CMOS battery?

Related questions

1. What are the advantages of CMOS logic?
2. Which gate is universal gate?
3. What is the CMOS memory used for?
4. Why is NOR gate called universal gate?
5. What is the use of CMOS inverter?
6. Where is CMOS stored?
7. What is stored in ROM memory?
8. Why the BIOS is stored in ROM and CMOS?
9. What is CMOS inverter in VLSI?
10. What is controlled inverter?

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15. #battery
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20. #energy