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Casio FX-991EX Battery Replacement

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The Casio FX-991EX can malfunction if the battery is discharged, even with solar power. Thankfully, replacing it is a simple job.

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  1. Casio FX-991EX Battery Replacement, Remove the battery cover: crwdns2935265:01crwdnd2935265:01crwdnd2935265:02crwdne2935265:0 Casio FX-991EX Battery Replacement, Remove the battery cover: crwdns2935265:01crwdnd2935265:02crwdnd2935265:02crwdne2935265:0

    • Remove the battery cover's screw using a Philips #0 screwdriver.

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  2. Casio FX-991EX Battery Replacement, Remove the battery: crwdns2935265:02crwdnd2935265:01crwdnd2935265:02crwdne2935265:0 Casio FX-991EX Battery Replacement, Remove the battery: crwdns2935265:02crwdnd2935265:02crwdnd2935265:02crwdne2935265:0

    • Use a spudger to remove the battery using the gap to the right.

    • Don't use sharp objects that may cause harm or damage. The battery can be hard to pop out.

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  4. Casio FX-991EX Battery Replacement, Replace the battery: crwdns2935265:03crwdnd2935265:01crwdnd2935265:02crwdne2935265:0 Casio FX-991EX Battery Replacement, Replace the battery: crwdns2935265:03crwdnd2935265:02crwdnd2935265:02crwdne2935265:0

    • The FX-991EX uses a 1.5V LR44 battery.

    • Slot the new battery into the compartment. Ensure that the positive side (with writing) faces up...

    • And the negative side faces the calculator's screen.

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  5. Casio FX-991EX Battery Replacement, Screw the cover back on: crwdns2935265:04crwdnd2935265:01crwdnd2935265:01crwdne2935265:0

    • Slot the battery cover back on and screw it down.

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If you need to reset the calculator after this, it's SHIFT+9 > 3 > =.

Otherwise, you're ready to crunch numbers again!

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