![]() ![]() some computer peripherals may not work properly, CMOS errors of various kinds will probably be displayed on the screen (CMOS Read Error, CMOS Checksum Error, CMOS Battery Failure, etc.) When the CMOS battery dies, the BIOS memory is deleted leading to: So, if You use your computer very often, CMOS battery load is decreased. Note: when the computer is turned ON, CMOS battery drain is practically zero - PSU (Power Supply Unit) provides power for the computer, BIOS memory included. So, constant current drain and increased temperature eventually kill the CMOS battery. The drain current of the CMOS battery is very low, but over time, it discharges the CMOS battery completely - the CMOS battery dies.Īlso, the temperature inside computers is usually increased, when compared with the temperature in the typical office or home - increased temperature also leads to the increased self-discharge rate. On average, CMOS battery lasts 3-10 years, sometimes even more. CMOS Battery vs RAID Disc Controller Battery.When something like that happens, the only course of action is to replace the CMOS battery. When the CMOS battery dies, BIOS resets its setting, including date, hard drive settings, boot order, etc., and in many situations, OS can't load properly. Removing the CMOS battery can also reset your BIOS so any configurations that were stored in there may need to be set again.CMOS Battery Dead? How to Replace the CMOS BatteryĬomplementary Metal Oxide Semiconductor (CMOS) battery is a small, mostly button/coin cell battery that provides power to the small memory that stores information about the BIOS settings. You should be able to tell straight away if it worked as the clock will stick when you set it and you wont receive any messages or weird problems, hopefully! You can take the battery with you to the shop to make sure its an exact match.Īfter you have purchased the battery you can just click it into place on the motherboard and close up the computer then it should be all good to go. When replacing the battery you want to make sure you get the battery with the same voltage. You can use a screw driver to push the little lever on the side of the socket and the battery should pop out. You will see the round battery situated on the motherboard. This post is just given as a basic guide on how a CMOS battery can be changed. Important: Make sure you learn about risks and harm that can be caused by accessing the internals of a computer or laptop. Also using an antistatic wristband and mat can help to prevent damage to your computer parts. (Laptops will be a little bit more difficult sometimes, depending on the model and would be recommended to remove the battery as well as the power cord just to be safe). Important: Make sure you turn off any power and unplug the cords before opening up the computer, and let it sit for a few minutes to make sure any left over electricity is gone. ![]() To access the motherboard you will need to open up the computer or you can check the motherboard manual that came with the computer if you received one. When replacing a CMOS battery you will need the correct battery that’s been used with the motherboard. Might not be able to locate the mouse, keyboard or printer.Drivers may stop working, it can trigger driver blue screens and crashes.Your computer will sometimes turn off or not start and will generally show startup errors explaining an issue with the battery.The date and time wont hold in the computer settings and will keep resetting.Some of the signs of a failing CMOS battery: When the CMOS battery starts to lose power and strength, the BIOS starts to lose data and the computer can begin to not work correctly. If you think your CMOS battery needs replacing you can call us to have your computer repaired. The CMOS also stores date and time information. The CMOS is a small, battery powered onboard chip that stores the BIOS settings of your computer which stores important information about what hardware is fitted to the motherboard as well as provides information to the drivers so they can be detected and instructed. ![]()
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