- 1). Place your Casio 1189 watch face-down on a flat, cushioned surface, such as a table covered with a pocket handkerchief or sheet of craft felt.
- 2). Unscrew and remove the four screws that hold the back cover to the rest of the Casio watch case. Set the removed screws and back cover aside while you replace the watch's battery.
- 3). Remove the protective components covering the battery compartment. Pull the protective rubber gasket out of the watch case with a pair of plastic needle-nose tweezers. Remove the white plastic plate to reveal the watch's battery compartment.
- 4). Take the old battery out of the battery compartment and discard it; recycle the battery if the appropriate facilities exist. Install a new battery in the battery compartment, making sure to observe the correct polarity.
- 5). Cover the battery compartment with the white plastic plate, followed by the rubber gasket. Replace the watch's back cover, reinsert the small screws and tighten them.
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