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Casio FX-991MS Battery Replacement

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This guide demonstrates a step-by-step process on how to replace a CASIO FX-991MS battery. While the scientific calculator has a solar panel, the battery is still able to die after long usage, therefore it is necesary to understand how to replace it. Here you will learn how to quickly swap out the battery quickly and efficiently.

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  1. Casio FX-991MS Battery Replacement, Battery: crwdns2935265:01crwdnd2935265:01crwdnd2935265:02crwdne2935265:0 Casio FX-991MS Battery Replacement, Battery: crwdns2935265:01crwdnd2935265:02crwdnd2935265:02crwdne2935265:0

    • Remove the case and flip the calculator backwards.

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  2. Casio FX-991MS Battery Replacement: crwdns2935265:02crwdnd2935265:01crwdnd2935265:01crwdne2935265:0

    • Use a Philips #0 head screwdriver to remove the five screws on the back of the device.

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  4. Casio FX-991MS Battery Replacement: crwdns2935265:03crwdnd2935265:01crwdnd2935265:02crwdne2935265:0 Casio FX-991MS Battery Replacement: crwdns2935265:03crwdnd2935265:02crwdnd2935265:02crwdne2935265:0

    • The top half of the calculator is tightly closed.

    • Carefully use an opening tool to slowly pry open the sides till it opens.

    • Apply a little bit of force if this is the first time opening the calculator.

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  5. Casio FX-991MS Battery Replacement: crwdns2935265:04crwdnd2935265:01crwdnd2935265:03crwdne2935265:0 Casio FX-991MS Battery Replacement: crwdns2935265:04crwdnd2935265:02crwdnd2935265:03crwdne2935265:0 Casio FX-991MS Battery Replacement: crwdns2935265:04crwdnd2935265:03crwdnd2935265:03crwdne2935265:0

    • Use an opening tool to gently remove the battery from the device.

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To reassemble your device, follow these instructions in reverse order.

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