CMOS Battery

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The Role of The CMOS Battery 

Your PC has to keep certain settings when it is turned off and its power cord is unplugged. These settings include the following:

• Date
• Time
• Hard Drive configuration 
• Memory 

Your PC keeps settings in a special memory  chip called the Complementary Mental Oxide Semiconductor.

(CMOS) chip. Actually ,CMOS (usually pronounced see-moss) is a type of memory chip. it is the parameter memory for the BIOS. But that doesn't translate into an easy-to-say acronym. So because it's the Important CMOS chip in the computer, it has come to be called the CMOS. To keep its settings,the memory must have power constantly . When you shut off a computer, anything that is left in main memory  is lost forever. To prevent CMOS from losing its information (and it's rather important that it doesn't), motherboard manufactures include a small battry called the CMOS battery to power the COMOS memory. The batteries come in different shapes and sizes, but they all perform the same function. Most  CMOS batteries look like either large watch batteries or small cylindrical batteries.