BIOS (CMOS) Battery

A BIOS (Basic Input/Output System) battery, (CMOS battery), is required to keep a computer's BIOS operational when it's not plugged in to a power source. 

• This is needed to Maintaining the time and date, BIOS settings.

• The battery is usually a CR2032 3 volt battery, but you should check the model of the existing battery before replacing it. The battery has an estimated life of three years to 10 years depending on usage. When the battery runs out of charge, the computer will usually display an error message. Some symptoms of a failing CMOS battery include..

• Incorrect or slow system date and time, Loss of BIOS settings when the computer is powered off