Motherboard of computer generally comes with embedded battery.computers are not only the devices that comes with battery –digital cameras and other gadgets often have. In computers as well in other devices,battery powers a chip called Real-time clock.In computer’s world generally referred to Real-time clock,Non-volatile Ram or CMOS Ram,CMOS is (complementary metal oxide semiconductor).
It is an on-board ram chip powered by CMOS cell which store system’s information and time.cell supplies constant power to RAM.It contains 64(or more) bytes of random access memory.10 bytes is used by system clock,left over amount for other system information.Every time computer boots up it uses BIOS (Basic Input/Output System) information.BIOS store all its setting in CMOS ram.Life of CMOS cell is upto 7-10 years depends on the type of uses.
How CMOS Cell is used to reset BIOS?
CMOS cell could be used to reset BIOS.Many a times system refuses to boot due to invalid setting change or some amateur tried to shows his skills.
Simple approach is just pull out the cell,removing cell is a simple way to revert the changes made in CMOS Ram.