The Cmos battery which stands for complementary metal-oxide semiconductor usually lasts about ten years. If you come across an error like press f-1 to continue or F2 to enter set-up or after setting the time you have to reset it again the next day. The cmos battery maybe the issue. What is the cmos battery you might ask, it keeps your computer settings. So the first thing you want to do is unplug your computer. Don’t forget to ground yourself using the esd(Electrostatic discharge strap).
Start by removing the cover to the computer. On the motherboard, using a flat head screwdriver or your finger, push the notch at the top, releasing the battery. Now head over to your local store like a Wal-Mart or radio shack.
Before installing the battery you want to make sure you have on your esd strap. Place the battery on the motherboard making sure it snaps into place, the numbers should be face-up. Close the lid.
Don’t forget to remove your esd strap from the computer and hook your computer back up. You will probably have to reset the date on the bios. After a couple of minutes you should see the computer running normally.
- How to Clear Your Computer’s CMOS to Reset BIOS Settings (howtogeek.com)