How long do cmos batteries last

This battery does not provide power to the entire computer but powers the CMOS when the computer is powered off. However, without the CMOS battery, you will be required to reset the clock every time you turn your computer on. The BIOS may also reset to its original factory settings each time you boot and shut down the computer.

Your computer will function, but everything in your BIOS like boot order, time and date, and other functions will be reset.

Be cautious while changing a CMOS battery, as it is situated inside the motherboard, which is the heart of a laptop; a little carelessness may result in serious damage. Replacing this battery is a simple process and anyone can do it while taking some extra precautions. It is a simple DIY process and could save you money in labor costs. It is also common to remove the battery and return a system to factory settings with flash-back CMOS settings when a system encounters a configuration problem.

Not sure how healthy your laptop battery is? A CMOS battery could last for as long as ten years. CMOS are initials for complementary metal oxide semiconductor and is in charge of recording information about time and date on the computer. It is common in old version of desktops and laptops, highly unlikely to be found in new versions as they are upgraded.

This is common in old versions of computers. This can be spotted as a chip in the interior of the computer that is its records about settings, disk drive, time and date. It is powered up by the CMOS battery. The CMOS battery comes into action after the computer is switched off. The CMOS keeps records on which hardware is connected to the computer so that it does not have to install it every time you boot it.

The hardware includes input devices like the mouse, the keyboard, printers and even the CPU. It would be time wasting if you have to install this hardware every time that you boot the computer system. You will realize that the computer is able to keep up with the date and time every time you switch it on. Unlike other devices, when the CMOS is in good condition, you do not have to set the date and time every time you boot it.

Most new version computers are updated and do not require a CMOS to store this information. They instead have this recorded in a flash memory or another component. Hence they continue working well even if the CMOS is not in good condition.

The normal life of a CMOS battery is 3 to 5 years. To be honest i've had them last up to 6 years. It is diffcult to say why your battery has died after just two years, it maybe just an inferior battery. I suppsoe you could ask the same question about a watch battery. Why does one battery last 12 months and another 18 to 24 months?

CMOS batteries are not that expensive and are easily changed, so long as you know where to find it on your motherboard. With some motherboards you cannot miss the battery whereas others it maybe hidden by wiring or somthing similar.

I wouldn't worry about it only lasting 2 years, just change it and, hopefully, this next one will last longer. This forum post is my own opinion and does not necessarily reflect the opinion or view of Microsoft, its employees, or other MVPs. Some last longer, some last less time. Just replace it and don't worry about it.. Your MB may have been manufactured a few months before going to the store and that also affects the battery life.

Another thing to consider is long shutdown periods. Choose where you want to search below Search Search the Community.