When CMOS batteries fail, they do so gradually. The first and best indicator that a PC's CMOS battery is dying is that the PC starts to lose time. If you notice that your PC's clock is running slow, or if you're consistently prompted to enter the date and time when you boot the PC, it's time to replace the CMOS battery.
Note: it's very important that the voltage of the replacement battery match the original. Check your motherboard's documentation to determine the correct battery for your system.
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