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It is possible that this model doesn’t have a battery. Many calculators are 100% solar powered.

However, if this model does have a battery, the battery is probably dead and needs to be replaced. These batteries are usually not rechargeable even though there is a solar panel.  Over time, the battery will die.

If there is a battery compartment or cover on the back, then it is simple to replace the batteries. Otherwise you may have to take the whole thing apart (assuming it has a battery in the first place).

Hope this helps.

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