How we can identify that CMOS baterry got failure

how we can identify that CMOS baterry got failure physically
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More about identify cmos baterry failure
  1. if you have the computer unplugged and your bios settings are not saved it means you have to change the battery as its not holding power and your bios settings are being reset
  2. 1) my laptop shutdown but power is on
    2)RAM WE CAN IDENTIFY GOT FAILURE
    3)pc working but 5min once shutdown
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