CASIO fx-82 SUPER. I bought it in 1.992, use it in college, at the university and 20 years more at the office. Never changed battery and im not going to retire it
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How do you remove the batteries from the Casio FX 82 LB : r/calculators
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Replacing the Battery
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Battery Scientific calculator, Model Name/Number: Fx-82 MS, Size: Handy