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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, but will do so. Dispose of a damaged battery via an e-waste collection site.

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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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FarmYard Gaming

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1,605 crwdns2915208:0crwdne2915208:0

crwdns2935295:0crwdne2935295:0

crwdns2918514:0crwdne2918514:0: 30

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Just discovered during a lecture that my battery has become a spicy pillow - if you're leaving this in storage be careful and monitor it, lest it explode and/or warp the case irreparably.

FarmYard Gaming - crwdns2934203:0crwdne2934203:0

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crwdns2936625:0crwdne2936625:0:

crwdns2936751:024crwdne2936751:0 20

crwdns2936753:07crwdne2936753:0 167

crwdns2936753:030crwdne2936753:0 774

crwdns2942667:0crwdne2942667:0 14,537