You may need a new "rechargable battery" Only a bonafide watchmaker will probably have the cell you need. Do NOT try a regular battery, won't work!
I have a watch which is solar type and the instructions say that several hours of sunlight will charge the battery but lamps need much longer (1 -2 days!), my watch now is left in a drawer.
If you haven't got instructions for your watch, to check what Casio recommend, you can get them on the net.
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
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