Texas Instruments TI-30X IIS Battery Replacement

Ensure that your calculator is a TI-30X IIS by looking in the top right corner of the front face.

Look at the rear face of the calculator and locate the four case screws. There are two at the top and two at the bottom.

Use a Philips 00 screwdriver to remove the four case screws on the rear face of the calculator.

With all four screws removed, use a flathead screwdriver or similar flat object to separate the front and rear casings.

There are six clips that keep the cases together. These areas will require extra force to separate, but use caution to not fracture the plastic pieces.

With the rear case off, the battery is exposed and accessible.

Using a pointed tool, slide the battery out of its terminal towards the near edge.

Once the battery is protruding from the contacts, remove it with your fingers.

Properly dispose of the old battery.

Replace the battery with an identical one, positive terminal up and negative terminal facing down towards the circuit board.

Following the previous steps in the reverse order to reassemble the calculator.