What happens if the motherboard battery is out of power?

In fact, the main function of the computer motherboard is to power the motherboard internal, mainly to save the internal clock and CMOS settings. There is an RTC oscillation circuit in the motherboard bridge area that requires the motherboard to continue working without any external power, to be ready for the next power-on, and the internal clock, and the battery is just powering the small portion of the circuit to fit its normal operation.

This is why when we cut off all the external power of the computer, the next time the computer is turned on, the computer will not mess up the reason, in addition, the motherboard BIOS settings are based on this principle.

After understanding the motherboard battery principle, what will happen to the motherboard battery? It is better to understand, without the motherboard battery, there will be the following kinds of phenomena:

1, the computer every boot, time will be restored to the initial time, that is, the time can not be normal synchronization, the problem of time is not allowed to restart the computer every time, its computer times have been restored to the factory set time;

2, the computer BIOS setting does not take effect;

This happens when the motherboard battery is out of power after entering the motherboard BIOS setup, reboot the computer, the BIOS project has been set up before the failure, and will revert to the original settings, such as the computer set the power-on password, but if the motherboard battery does not power, will appear to set the power-on password invalidation, the next can still directly into the computer;

3, there is also a situation, the computer BIOS is not power, the computer can not start the normal boot, the display is a black screen interface. Of course, there are some computers do not have a motherboard battery can also boot, but often without the motherboard battery to boot, easy damage to the motherboard South Bridge chip, resulting in the motherboard damage.

Usually the life of the computer motherboard battery is four years, in general, we have three years to replace the battery, computer use four or five years later, it is easy to lead to battery aging, easy to lead to time, the motherboard BIOS set failure, the solution is to replace the battery, of course, so that the computer has been plugged into the external power supply, But generally it is convenient to change the battery.