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The memory and real-time clock are generally powered by a CR2032 lithium coin cell. These cells last two to ten years, depending on the type of motherboard, ambient temperature and the time that the system is powered off, while other common cell types can last significantly longer or shorter periods, such as the CR2016 which will generally last about 40% as long. Higher temperatures and longer power-off time will shorten cell life. When replacing the cell, the system time and CMOS BIOS settings may revert to default values.
Flashing the BIOSWhere the BIOS is stored in rewritable memory, flashing the BIOS is overwriting the BIOS contents with a BIOS image. This is done to update the BIOS to a newer version either to fix specific bugs, support newer hardware, or fix a damaged BIOS. However, care must be taken when doing this because if it is not done correctly, the system will usually become inoperable.
One additional sideeffect of low CMOS battery is not only the slowdown of the clock on your computer
Quote from: DrChemistry on 31/03/2010 21:12:44One additional sideeffect of low CMOS battery is not only the slowdown of the clock on your computerPlease see the thread referred to earlier: a low CMOS battery will not cause the clock to slow down.
I think my PC battery was a bit low - a few days ago I turned it on in the morning and a screen came up with the information that my CM02 battery was low and was told to hit F2 and F1 - then select something else (forgotten which) in order to continue with the usual start up. I left the computer, unusually for me as I am normally mean with electricity use, on standby when I went out that day in order for the battery to recharge. It seems much better now - even the time is keeping up (21:39 at moment).
The CMOS battery is dead or dyingExplanation: The system is exhibiting behavior that implies that the CMOS battery is dead. This can include lost CMOS settings, the real-time clock losing time, or of course dead battery warnings at boot time.Diagnosis: On an older PC, it is normal for the CMOS battery to fail at some point in time. They usually last for many years, with over five years being the norm, at least on older machines. Nobody knows for sure how newer machines will fare. On a new motherboard, this sort of message is a sign of a defect, although you shouldn't worry about it if it appears only the very first time the board is powered up. The solution is replacing the battery, and this can be an either easy or impossible task, depending on how much thought the motherboard manufacturer put into the design.