Changing the CMOS battery on a laptop involves opening the laptop case, locating the battery and replacing it with a new one. While the process may seem easy, precautions must be taken as damage can be done to the system board, or the battery may explode if it is improperly installed.

The following shows the basic steps in replacing a laptop CMOS battery.

  1. Open the laptop
  2. Open the laptop case and locate the CMOS battery. Keep in mind that this may void the warranty of the laptop.

  3. Remove the battery
  4. In most laptops, the battery lies flat on the board, while it is angle mounted on other laptops. Check the battery holder for any tabs that may release the battery, and remove the battery carefully.

  5. Replace the battery
  6. Replace the battery with a new one, making sure to install the new one properly, and then close the laptop case.