Rechargeable batteries, unfortunately, do not last forever. The older the battery and the more it's been used and recharged, the shorter the life. You will get to a point where the battery will only last 30 minutes or so, and will take only 20 minutes to charge (if you have a charge indicator for you battery).
My suggestion is to look online for a replacement battery. There are many places that sell generic batteries that work very well, so you don't need to spend the extra money to buy a real Casio battery. Just do a search for your battery model number.
Good luck.
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