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Additional features overview/details
Appendix
IND100077-219
Battery Status and Alarm
CMOS battery voltage is monitored during each boot and the following warning will show if it’s below set low limit:
WARNING!!!
The CMOS battery capacity too low.
If this error is displayed, it is recommended to schedule service of the unit for replacement of CMOS battery.
When the CMOS battery is dead, or voltage is too low, it will not keep track of time/date when power is disconnected.
BIOS settings will still be remembered, but bootup takes longer time and some BIOS related functions may not work
optimally without battery.
The low limit is set to 2.4V by default. This is the minimum voltage required by main board for full functionality and to
keep track of time and date while powered off.
The low voltage limit can be changed or disabled in BIOS by following the steps:
- Enter BIOS by pressing Del key during boot.
- Go to Advanced tab and select RTC Battery Alarm Configuration submenu
- Select option: RTC Battery Alarm Voltage
- Default value is 2.4V
- Limit can be set to any value between 2.0V and 3.0V (0,1V steps) or disabled to not
show any warning.
- Press F4 to save and exit
To check the current CMOS Battery voltage in BIOS go to: Advanced -> Hardware Monitor -> VBAT value
If the battery is dead or not connected the voltage will be reported as <1V.
Nominal CMOS battery voltage is between 3.0-3.2V when new and will decrease gradually over time.
Once voltage is below 2.4V it will no longer function properly, and there is risk of time/date loss.
The expected lifetime of CMOS battery is 5+ years. Depending on usage and storage conditions, the actual lifetime
may vary between 3-10 years.