My casio exilim battery shows low battery even after charging completely.
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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