Casio Scientific Calculator: owned since 1999, used through high school years 8 - 12, a degree in accounting, my current workhorse in my underwriting job. Maybe my favourite possession. : r/BuyItForLife
CASIO fx-82ES PLUS Battery Replacement - iFixit Repair Guide
Casio Calculator, FX-82TL - zala.bt
Power Supply; Replacing The Battery - Casio fx-82TL User Manual [Page 16] | ManualsLib