Rayovac Alkaline AAA Batteries (16-Pack) in the AAA Batteries department at Lowes.com
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Casio - FX-82MS. I bought it in high school, used it in University and now on my 4th year as a Professional Accountant. Haven't changed the battery once. : r/BuyItForLife
HOW TO CHANGE CALCULATOR BATTERY / CASIO CALCULATOR / FX-991MS / DIY / JACK OFALL - YouTube
Casio fx-85GTX Scientific Calculator, Black – XavOcean