There is a small shiny coin cell battery in your computer. It is almost always the standard 2032 . This battery is recharged by your computer but has a life of about 5 to 8 years. This battery keeps constant power to the memory that contains today’s date & time as well as a lot of the features in your system. When it starts to fail, it commonly will start asking you to re-enter the date each time you startup.
For Notebook PCs it is likely going to be difficult to find the battery and will require a special part, requiring the services of a technician.
For Desktop computers, this is an easy change:
- Unplug the power to your computer
- Hold the ON button in for 7 seconds
- Lay the computer on its side with the side where the wires are, down
- Remove the side panel
- Peer in there and you will see a shiny silver battery about 1/2″ in diameter. It looks like a quarter. That’s the battery
- Go to just about any store and buy a 2032 coin cell battery. They cost less than $5
- Find a very tiny flat bladed screw driver (like one used for your eyeglasses)
- Very carefully pry the battery loose. It will pop up so be prepared to catch it.
- Press the new battery in with the embossed markings on the up-side facing you.
- Close the side panel
- Turn it up vertical again
- Start up the computer
Your computer will now need to have the date and time set but only once more — at least for this 5 years. You need to enter the BIOS, which you do by pressing F2 immediately on startup in most systems to get to the place where the date and time is stored. Put in current time and date. Close this the way it tells you to save what you did. You may hear more whirring and chugging while some of the stuff is again set up.
Once Windows is up and running again
- Click once on the time/date in the bottom right corner
- Click on Change date and time settings
- Click Internet time
- Click change settings
- Select time.b.nist.gov and click the Update button — this will synchronize the computer clock with the US govt time labs system