How to Remove the CMOS Battery on a Toshiba Laptop

By Contributing Writer

The CMOS (Complementary Metal Oxide Semiconductor) battery is an auxiliary power source in your Toshiba laptop. Its main function is to deliver small amounts of power that send information to work with the RAM of the computer, allowing it to power on. If the date and time on your computer are constantly needing to be reset, chances are your CMOS battery may be dying. If you have some extra time and are willing to put in some work, you can remove the battery yourself.

Things You'll Need

  • Small Phillips screwdriver
  • Small flat-head screwdriver

Step 1

Turn off the laptop and remove the AC adapter. Remove the battery from its compartment on the bottom of the computer. Turn the laptop over and remove the screws holding the DVD drive in place and pull out the DVD drive.

Step 2

Remove the remaining screws on the bottom of the computer. These screws secure the wireless card cover, the memory card cover and the modem card cover. Then remove all of the plastic covers. Remove the wireless card by sliding it gently out.

Step 3

Remove the corner screws on the bottom of the laptop securing the bottom housing. Remove the housing by pulling it away from the laptop. Remove any remaining, exposed screws on the bottom of the computer.

Step 4

Turn the laptop over and remove the thin plastic strip that runs along the border of the keyboard with your fingernails. If your fingernails aren't long enough, a plastic card will work as well.

Step 5

Remove the two screws on either side of the keyboard securing it to the computer. Remove the keyboard.

Step 6

Remove all of the exposed screws where the keyboard used to sit. These screws secure the top housing to the computer. Remove the housing, exposing the motherboard.

Step 7

Locate the CMOS battery. It is a small battery about the size and shape of a coin and should be easily visible on the board. Depending on the model of Toshiba you are working on, the CMOS battery will either be secured with a clip or connected to the board by two small cables. Either way, they are easily removable.

Step 8

Disconnect the battery by pulling gently away from the cables or by popping the clip out. Your CMOS battery can now be removed.