CMOSbatterit

CMOSbatterit, often referred to as a CMOS battery, is a small, coin-shaped battery commonly found inside computers and other electronic devices. Its primary function is to provide power to the CMOS (Complementary Metal-Oxide-Semiconductor) chip. This chip stores essential system information, such as the computer's date and time, BIOS (Basic Input/Output System) settings, and hardware configurations. Even when the main power source of the device is turned off, the CMOS battery ensures that this crucial data is retained. Without a functioning CMOS battery, these settings would be lost each time the device is powered down, requiring the user to re-enter them every time the system starts.

The typical CMOS battery is a lithium coin cell, most commonly a CR2032 model. These batteries have a long lifespan, often lasting for several years, depending on usage and environmental factors. Symptoms of a failing CMOS battery include the system clock resetting to a default date and time upon startup, encountering BIOS error messages, or experiencing issues with hardware configurations. Replacing a CMOS battery is generally a straightforward process for most users, though it requires opening the computer or device. The battery is usually located on the motherboard.