How Long Does a CMOS Battery Last and How to Prolong Lifespan - MiniTool

How long can a CMOS battery last? The lifespan of CMOS batteries is not static, it is affected by a variety of factors. This article will provide you with practical tips for extending the life of CMOS battery and help you identify signs of battery failure.

CMOS (Complementary Metal Oxide Semiconductor) batteries power the CMOS chip on the computer motherboard, and can keep the chip running even when the computer is turned off. Almost all computers are equipped with CMOS batteries, which are mainly used to store important data such as system time and date.

CMOS batteries are crucial for computer startup and the operation of BIOS (basic input and output system) firmware. Therefore, it is also often referred to as a BIOS battery or motherboard battery. Whether it is a laptop or a desktop computer, the motherboard relies on this battery to save BIOS settings.

Average life of CMOS batteries

The life of a CMOS battery varies by usage. The more frequent the computer is, the longer the battery life is usually. Generally speaking, if the power supply (PSU) is off or the power switch is off, the average life of a CMOS battery is about three years.

However, the actual life of a CMOS battery may be between three and five years. If used properly, it can even be extended to ten years or more. The following section will explain how to extend the life of a CMOS battery.

Tips for extending CMOS battery life

To extend the life of a CMOS battery, it is necessary to understand the factors that affect its life span. As mentioned above, the frequency of computer usage is one of the key factors. Therefore, regular computer use is the most effective way to extend the battery life of CMOS.

In addition, high temperatures and long-term power outages can shorten battery life. It is recommended to use the computer in normal temperature environments, which helps to extend battery life.

Signs of CMOS battery failure

The following signs indicate that the CMOS battery may fail and a new battery needs to be replaced:

• The settings of drive type, floppy drive, digital locking, etc. in the computer settings have changed.
• An error message "Startup error, disk drive cannot be detected" appears.
• Invalid configuration information is displayed on the screen.
• "Run Settings" is displayed on the screen.
• "Press F1 to continue" is displayed on the screen.
• After pressing F1, invalid drive specifications are displayed on the screen.
• A clock error or clock message appears.
• The computer continues to display the wrong date or time.
• The computer is running slower and cannot perform any tasks.
• Some drivers may be lost or do not work properly.
• Unable to connect to the internet.
• The mouse may not respond properly.
• The computer made a constant beep.

To avoid data loss due to battery failure, it is highly recommended to back up data regularly. You can use the "Copy Disk" or "Copy Partition" function of the MiniTool Partition Wizard to back up data to other drives (including removable storage devices such as USB drives and SD cards).

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