CMOS (Complementary Metal-Oxide-Semiconductor) is a battery powered semiconductor chip which is used to describe the small amount of memory on a computer motherboard. It stores information about the BIOS settings. This information is from the system time and date to system hardware settings of the computer. It is a technology for constructing integrated circuits. The standard lifetime of a CMOS battery is around 10 years and also the personal computers contain a small amount of battery powered by CMOS memory which holds the date, time, and system setup parameters.

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