Texas Instruments TI-92 Backup Battery Replacement

Grab the back of the calculator with one hand and the cover with the other.

Pull the cover off from one of the sides for easy removal.

Orientate the calculator with the top facing towards you.

Slide the locking tab,found on the top part of the calculator, to the unlock position.

"Locking Tab"

To remove the back cover, slide the cover away from the locking tab towards the bottom of the calculator until the cover no longer slides.

Then with the front of the calculator facing down, pull up on the back cover.

The calculator should now be orientated with the front facing down, as shown in picture 2.

Using a #00 Philip Screwdriver remove the 19mm screw located near the center of the back of the calculator on the panel with words "Test Access"

Remove the screw and lift the panel to access battery.

The backup battery can now be seen underneath a small metal cover held by a screw.

Using the same screwdriver, unscrew the 4.6mm screw located under the panel and left of the backup battery.

Remove the metal cover keeping the backup battery in place.

Use an Ipod Opening Tool or a similar tool to pull up on the right side of the backup battery.

The battery should pop out of position.

After the battery has been tilted out of its socket, simply remove it with your hands.