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Casio A158W-1 Battery Replacement

What you need

  1. Casio A158W-1 Battery Replacement, Battery: step 1, image 1 of 3 Casio A158W-1 Battery Replacement, Battery: step 1, image 2 of 3 Casio A158W-1 Battery Replacement, Battery: step 1, image 3 of 3
    • Using the Phillips #00 screwdriver, remove the four screws from the back panel of the watch.

  2. Casio A158W-1 Battery Replacement: step 2, image 1 of 1
    Tool used on this step:
    Tweezers
    $4.99
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    • With your fingers, or tweezers if available, remove the rubber gasket surrounding the base of the watch.

  3. Casio A158W-1 Battery Replacement: step 3, image 1 of 1
    • Carefully remove the centerpiece of the watch from the casing.

  4. Casio A158W-1 Battery Replacement: step 4, image 1 of 1
    • Using the Flathead screwdriver, push the four tabs located around the centerpiece inwards to open it up.

  5. Casio A158W-1 Battery Replacement: step 5, image 1 of 2 Casio A158W-1 Battery Replacement: step 5, image 2 of 2
    • Open up the centerpiece to reveal the battery.

    • Carefully remove the dead battery.

  6. Casio A158W-1 Battery Replacement: step 6, image 1 of 1
    • Insert the new Cr2016 3V Lithium battery into the centerpiece.

    • Reattach the back of the centerpiece together.

  7. Casio A158W-1 Battery Replacement: step 7, image 1 of 2 Casio A158W-1 Battery Replacement: step 7, image 2 of 2
    • Insert the centerpiece back into the casing of the watch with the "front" facing down.

    • Position the rubber gasket back into place.

  8. Casio A158W-1 Battery Replacement: step 8, image 1 of 2 Casio A158W-1 Battery Replacement: step 8, image 2 of 2
    • After putting the back panel of the watch into place, use the Phillips #00 screwdriver to screw four screws into place.

  9. Casio A158W-1 Battery Replacement: step 9, image 1 of 1
    • Finally, reset the Casio watch to the correct time.

    • Make sure all buttons are operational.

Conclusion

To reassemble your device, follow these instructions in reverse order.

3 other people completed this guide.

Libaan Major

Member since: 09/10/21

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1 Guide authored

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One Comment

Thanks for the guide! I successfully managed to replace my battery. A few things I noticed during my own attempt:

1. The centerpiece cover only fits in one way when replacing it over the battery, because one side of the watch has two buttons and the other side only has one.

2. Immediately after replacing the battery and replacing the centerpiece cover, only some segments of the display were working and the watch was non-functioning. After a little googling I discovered that a CMOS clear might be required, and I followed https://rajgopalmenon.wordpress.com/2020... in order to do this. Within 5 minutes of doing the CMOS clear my watch started working again.

Sanuja - Reply

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