CASIO fx-300 MS Battery Replacement

Introduction

If your CASIO fx-300 MS scientific calculator is not functioning, it may be time to replace the battery.

After so many hours of use, the battery will come to the end of its lifespan. It is also possible that the battery is faulty or damaged. This can be a hindrance and hazard as you would have to buy a new calculator or face the threat of chemical burns from alkaline residue.

Follow each step with caution if you want replace the battery for your CASIO fx-300 MS calculator.

What you need

Step 1 Battery

CASIO fx-300 MS Battery Replacement, Battery: step 1, image 1 of 3

CASIO fx-300 MS Battery Replacement, Battery: step 1, image 2 of 3

CASIO fx-300 MS Battery Replacement, Battery: step 1, image 3 of 3

Press SHIFT+AC to turn off the calculator.
Press the shift button, and a symbol in the top-left corner should appear. Afterward, push the AC button.

Edit

Step 2

CASIO fx-300 MS Battery Replacement: step 2, image 3 of 3

Flip the calculator so the back of the device is facing up.
Use a Phillips #0 screwdriver to remove the six 5 mm screws.

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Step 3

CASIO fx-300 MS Battery Replacement: step 3, image 3 of 3

Use a spudger to pry the back case from the calculator.
Gently work your way around the edge of the calculator to release any clips before separating the two halves.
If you feel resistance when removing the back case, check to make sure you didn't miss a screw.