How to change out the battery for aq-164w - Casio ILLUMINATOR DUAL TIME MEN WATCH Watch for Men

Hi Cassandra.

this is what i found out from the net.

Most hybrids are compatible with any CR2430 coin cell battery, which allows them to hold a charge for 4 to 6 months. Swapping in a new coin cell lithium battery can be done easily and in just a few simple steps, plus CR2430 batteries are available from most retailers that sell batteries.

CR2025 ( Lithium Coin Cell 3.0V)

https://casiofanmag.com/batteries/module-3793/

https://components101.com/batteries/cr2025-lithium-coin

You can get instructions from the Casio web site.

Go to the casio web site "casio.com".

Select "support" and the "manuals",
watches;

Accept terms

Select "watch manual archive"

Read the number of the back of your watch and enter it into the search box

How do I change time to GMT from British Summer time on Casio WR100M 3793 AQ 180 W?

Click on my profile (escapement), then click on Tips and Tricks. There you will find link to all CASIO watch manuals. Rate me, please .

If you haven't got instructions on how to do this, you can get instructions from the Casio web site.

Go to the casio web site "casio.com".

Select "support" and the "manuals",
watches;

Accept terms

Select "watch manual archive"

Read the number of the back of your watch and enter it into the search box

This little spring is called coil spring and must be inserted in to the hole in movement. Usually there should be writing on movement with an arrow pointing to that hole. If you can not find the writing, then try to put coil spring in different holes one after another, till you hear the watch beeping again.
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You can find the instructions at this web site http://www.casio-europe.com/euro/watch/collection/aq-230ga-9dmqyes/ :)

I have a similar model.  The electronics sometimes needs to be reset after the battery is changes.  Get a magnifying glass and look closely at the stainless frame around the battery.  There is a small AC mark and a triangle which points toward a small gold contact down in an adjacent hole.  This contact must be shorted momentarily to the + side of the battery to reset the display.  You can bend a metal paper clip to make the connection.  You may have to try several times before it resets. It should reset to 12:00 and start running.