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Casio fx-100s scientific calculator- Purchased 1992 / No Battery change /still going strong : r/BuyItForLife
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How To Replace Calculator Battery | Casio Scientific Calculator Battery Replacement Step by Step - YouTube
Casio FX-115MS Battery Replacement - iFixit Repair Guide
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Calculators, anyone? My trusty FX-115s. Actually had to change the battery recently, after about 20 years of use. : r/casio
