No matter what brand of notebook, it has a button battery on the motherboard, its role mainly in the following several functions.

Provide power to the motherboard

       The motherboard battery provides power to the motherboard's storage unit. If the motherboard battery is dead, the motherboard settings will not be saved. After each setup is complete, the notebook will automatically revert to the factory settings after rebooting.

Automatically update system time

       I do not know you have not noticed, after years of use in a notebook, each boot time is not right. This is because the aging of the motherboard battery does not store power and will not be saved or automatically updated to the current time. After leading to the notebook off, the time is reset.

Guaranteed smooth start

       If the motherboard's coin cell battery is dead, the system will not automatically read the computer's hardware information. Every time you turn on your machine, press F2 or F1 to read the next step.

Protect the motherboard

       After the mainboard battery is dead, it may appear that the notebook's power light is on, but the monitor does not respond. Although some motherboards can boot even when the battery is dead or no battery is installed, it is easy to speed up the loss of the motherboard. So don't look at it as a small motherboard battery. Its role is not small either.