Why Do Motherboards Have Batteries?

Sometimes motherboards are quite complex; they contain many small parts plus a powerful CPU. So, it would make sense to have batteries with an extra power supply. This article discusses the pros and cons of these batteries and how they’re used.

Why do motherboards have batteries?

Motherboards use batteries to onboard power features, such as the BIOS, boot from a USB drive, or retrieve basic system information. They also have a battery to keep the CMOS clock running at all times in systems that still use it.

In recent years, motherboard makers have been moving away from using batteries to power these features and instead using energy harvesting techniques like capacitive touchscreens or infrared sensors.

However, some features like the BIOS or CMOS clock may still need a battery because they cannot always run off energy harvesting methods.

A Brief History of Motherboard Batteries

The history of motherboard batteries goes back to the early days of computing. Early personal computers often didn’t have any way to store data other than on a user’s hard drive, so they would periodically need to be booted up to retrieve information.

To do this, these early computers used what is now called a “keyboard-based bootloader.” This meant the computer needed access to an external power source (usually a wall outlet) to start up.

One solution was to embed a battery into the computer case itself. This allowed the computer to start up without any external power and stored the bootloader software on the battery.

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Over time, more and more devices became capable of storing their bootloaders, so it made sense for motherboard batteries to become obsolete.

However, motherboard batteries remain popular today for a few reasons. First, they’re always included with new computers because they’re such a low-cost component.

Second, they’re still useful for storing bootloaders or other small programs that don’t require constant access to power. Finally, some motherboard manufacturers include features that allow users to charge their batteries while their computer is off (known as “battery backup”).

Battery life of a motherboard

The motherboard is the heart of your computer, and it is responsible for a lot of the essential functions, such as powering the system, managing peripherals, and allowing you to install new hardware. For a motherboard to function properly, it requires a good battery life.

Different motherboards require different battery life. Some might need only 2-4 hours, while others might need up to 12 hours or more. It all depends on the design and features of the particular motherboard.

If you want your motherboard to last long without requiring a power cord, invest in a high-capacity battery.

What does a battery do for a motherboard?

A battery is a power source for a motherboard. It gives the board enough power to run basic functions, like turning on the computer and getting online. Some motherboards have batteries that last for a certain amount of time, while others can replace batteries when they run out of power.

How does a motherboard get power from a battery?

A motherboard typically gets power from a battery to help preserve the system’s hardware and data during a power outage.

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When a system boots up, it checks for an available power source (usually from an AC adapter), and if it can’t find one, it goes into Safe Mode. If the system falls asleep or there is no AC adapter, the motherboard will turn to its battery to keep the hardware running.

Why do Motherboards Need Batteries?

Motherboards need batteries to run their various features, such as the processor and memory. The motherboard will shut down when a battery is used to conserve power.

If you have a battery-powered device connected to your computer, make sure it is plugged into an outlet when turned off. This will ensure that your devices are powered down properly and won’t drain your computer’s power supply unnecessarily.

Benefits of the Battery

  1. Motherboards typically have batteries to keep operating during a power outage.
  2. Batteries can store energy when the motherboard needs it, such as when waking up from sleep or during a suspend or hibernate operation.
  3. Batteries can also power the board when there is no power available, such as when the computer is being shipped and is not connected to an outlet.
  4. Batteries can also store data that may need to be kept after the power is turned off, such as user profiles or configuration files.
  5. Finally, batteries can be used to track how long the system has been powered on for performance monitoring purposes.

Disadvantages of the Battery

There are a few disadvantages to having batteries in your motherboard. The first is that if the battery fails, it can cause all sorts of problems with your computer.

This is because the battery is directly connected to the motherboard, and if it goes bad, it can cause all sorts of issues with your computer. 

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Another disadvantage to batteries is that they tend to go bad over time. This means they will lose their power and will not be as effective as they used to be. This can result in a lot of problems with your computer, especially if you don’t have a backup battery available. 

Overall, there are a few disadvantages to having batteries in your motherboard. However, they are still an important part of modern computing, and there are ways to work around some of the problems they bring.

Frequently Asked Questions

What are motherboard batteries?

A motherboard battery is a small, rechargeable battery that powers some components of a computer, such as the CPU and memory. They’ve usually hidden away on the motherboard, and you must take care when removing or replacing them to avoid damaging your computer. 

What are the benefits of using a motherboard battery?

One benefit of using a motherboard battery is that it can save money. You can avoid buying new parts if your computer crashes by powering some of the components on your computer with a battery.

How do I replace a motherboard battery?

You will likely have to remove the entire motherboard from your computer to replace the battery. Be sure to note how the battery is attached so you can reattach it correctly when replacing it.


Motherboards typically have batteries so they can be powered when the computer is not used. If a power outage occurs, the motherboard can still boot up and start working again. Additionally, motherboards often have batteries in case of theft or damage to the computer itself.

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Matt Wilson
By Matt Wilson

Matt Wilson is a PC gaming and hardware expert with years of experience. He's a trusted tech product reviewer for gamers and tech enthusiasts.

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