CMOS
Alternatively referred to as a Real Time Clock (RTC), Non-Volatile RAM (NVRAM) or CMOS RAM, CMOS is short for Complementary Metal-Oxide Semiconductor. CMOS is an on-board semiconductor chip powered by a CMOS battery inside computers that stores information such as the system time and date and the system hardware settings for your computer. To the right is an image of a CMOS battery on a IBM compatible computers motherboard and the most common CMOS battery you're likely to encounter with your computer.
The picture is an examples of batteries that may be used in a computers to power the CMOS memory. As mentioned above the most common battery is the coin cell battery (lithium battery), usually about the size of a U.S. Nickel.
The standard lifetime of a CMOS battery is around 10 Years. However, this can vary depending on the use and environment that the computer resides.
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