Batteries

Batteries

CMOS Battery And Its Usage

CMOS Battery gives 'backup power' to CMOS (Complementary Metal Oxide Semiconductor) of a computer to keep some parameter values, eg: RTC (Real Time Clock). These primary parameters shall be used when the system gets booted again. Many computers use CMOS memory to hold current time and date. The CMOS memory and the clock circuit that increments the time in it are powered by a small battery called RTC, so the time is correctly updated even when the computer is unplugged.