Every PC will has a battery to store the CMOS settings. The same goes for laptops but with a smaller battery. An exception of Macs which used a capacitor to keep the PRAM settings.

For desktop, changing is easy with just a standard CR2032 battery. For laptops, usually a sealed CR2032 or smaller with a 2-3 pin connector.

Everything can DIY. Good to learn too.

This post has been edited by acbc: Jan 9 2023, 06:44 PM