CMOS Backup Battery:
An onboard battery saves the CMOS memory to keep the BIOS information stays on even after
disconnected your system with power source. Nevertheless, this backup battery exhausts after
some five years. Once the error message like "CMOS BATTERY HAS FAILED" or "CMOS
checksum error" displays on monitor, this backup battery is no longer functional and has to
To renew the backup battery:
Power off the system and disconnect with AC power source.
Remove the exhausted battery.
Insert a new CR2032 or equivalent battery. Pay attention to its polarity. The "+" side is its
Connect AC power source and power on the system.
Enter the BIOS setup menu. Reconfigure the setup parameters if necessary.
Danger of explosion may arise if the battery is incorrectly renewed.
Renew only with the same or equivalent type recommended by the battery
Dispose of used batteries according to the battery manufacturer's instructions.