Your computer will show a message such as вЂњBooting Error, unable to detect disk drive.вЂќ.It may be causing booting problems since your computer does not remember information about the disk drive. All of the settings like drive type, FDD, NUMs lock, etc., in the computer setup will be changed.For example, your computer date will be set to factory settings, something like.

In some instances, the date and time getВ set to factory default. The CMOS settings like date and time get changed. If the voltage drops between certain levels, your computer loses the memory. The battery provides power to CMOS memory and the real-time clock. However, the life of the battery gets extended to 5 years when you use it regularly. If the computer is not plugged in regularly, the life of the battery is normally 3 years. The computer power supply increases theВ availability of a standby current and hence increases theВ life of the battery. You need to use the computer regularly to extend the life of the CMOS battery. The CMOS battery is a small battery fitted on the motherboard of your computer. Learning to Detect a CMOS Battery Failure So, it is very important at the time of booting your computer and other tasks. The CMOS battery always provides power to the CMOS chip вЂ“В i.e., even when your computer is OFF вЂ“ to save all the settings. The CMOS (Complementary Metal Oxide Semiconductor) chip on your computer remembers everything like the disk drive, time and date, etc., so you donвЂ™t want to have a CMOS battery failure. Image Credit вЂ“ /Д®very computer has a small battery on its motherboard used to provide power to the CMOS on the computer.

Dell battery diagnostics test