A motherboard, also known as a mainboard or system board, is a crucial component of a computer system that connects all the components together. Without it, a computer would simply not function. One of the most common questions people ask is why does their motherboard have a battery? In this article, we will explore the reasons behind this.

The primary reason for a motherboard to have a battery is to keep the real-time clock (RTC) running. The RTC is a small quartz crystal clock that keeps track of the time even when the computer is turned off or unplugged. It is a separate chip on the motherboard that relies on a battery for power. Without this battery, the RTC would become reset every time the computer lost power, and the system would not be able to keep an accurate record of time.

Another reason for a motherboard to have a battery is to keep the BIOS settings saved. The BIOS (Basic Input/Output System) is a firmware that is built into the motherboard and is responsible for initializing the hardware components and booting the operating system. It also stores important configuration settings, such as the boot order, system date and time, and hardware settings. A battery powers the BIOS chip, enabling it to save these settings even when the computer is turned off.

In older computer systems, the battery used on the motherboard is a replaceable CR2032 cell, which can last for several years. However, in modern systems, the battery is usually built-in and integrated into the motherboard itself, making it harder to replace when it dies. The battery’s lifespan varies depending on the manufacturer, but it typically lasts between 2 to 5 years.

Finally, a battery on the motherboard is also used to power the Advanced Configuration and Power Interface (ACPI) controller. The ACPI is responsible for managing the power state of the computer, including sleep or hibernation modes. With a battery backup, the ACPI can maintain the system’s power state and resume it from the last state, even if the power is suddenly disconnected.

In conclusion, the battery on your motherboard may be small, but it plays a crucial role in keeping your computer running smoothly. It helps to maintain the RTC, the BIOS settings, and the ACPI controller. The battery life may be limited, but it is easily replaceable and provides a low-cost solution for keeping your computer functioning correctly.