Introduction
If your Casio watch (MTD-120) has been losing time, showing incorrect time or stopping, it most likely has a dead or dysfunctional battery, which requires replacement.
A functional battery provides power to the watch such that the hands of the watch start functioning properly to show correct time.
Tools
Parts
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Place the plastic cover back over battery compartment.
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Align the marked area of the plastic cover with the crown of the watch.
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Conclusion
Follow the link provided in step 5 to find more information on recycling your old batteries.