Casio 306 aq 307 watch what battery type

Question edited for clarity.
Question moved from Computers to Casio Watch.

Tip & How-To about Watches

Changing Watch Batteries
Lots of posters ask "what is the battery in my (name of watch)" with a view to changing it yourself. This is a bad idea for many reasons. You don't have the tools or knowledge to remove a rotary screw on back, or the gasket sealant for a waterproof watch. Some fashion watches have 4 traditional screw and need professional grade jeweler screwdrivers. Also, there are about 20 batteries commonly used in watches, in various sizes and internal technology, Lithium Ion, Silver Oxide and Manganese Alkaline. If you buy them, you generally have to buy 10!

Don't sweat the details. Just take the watch to your local jeweler. They have all the batteries at hand and the tools to remove the back. It is done whilst you wait for $8 to $15!

Posted by ADMIN... on Dec 31, 2018

Or the same type that came out. Or whatever it says inside the case. Or https://best24watch.com/batteries-casio-watches/
AW-30 SR920W SR920W Battery

CR2025 ( Lithium Coin Cell 3.0V)

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

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

go here > http://world.casio.com/wat/download/en/manual/

go here > http://www.gshock.com/support/

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

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

Click on "search" and the download your instructions.

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.
Rate me, plz.

You can find the instructions at this web site http://www.casio-europe.com/euro/watch/collection/aq-230ga-9dmqyes/ :)

The Casio web site has all manula on line. The model no is 3352

Good luck