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I have a Casio fx4500 calculator and have replaced both batteirs with the new ones but it still says low battery everytime i turn it on.what seems to be the problem? Thanks

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Seems to be a common problem on this otherwise great calculator that helped me through both high school and university. I've had mine for nearly 20 years and this problem showed up a few years ago. But I remember classmates reported the same problem when it was almost new.

If replacing batteries isn't helping, the problem is most likely caused by oxidation on the springs connecting the battery holder to the main PCB. The solution is as follows:

1. Remove the metal back cover (2 screws)
2. Remove the plastic back lid by removing the black screws (leave the batteries mounted) and CAREFULLY slide the back lid to the lower end (where the EXE button is located). Do not lift while sliding until the lid easily comes off.
3. On the back side of the plastic lid, very carefully bend the the two metal connectors ~1 mm on both batteryholders to increase their tension.
4. Clean the connecting pads on the PCB and the metal springs with de-oxidizer solvent.
5. Re-assemble and your 4500P calculator should be good as new.

Posted on Mar 29, 2012

  • Reza Asgharian Dec 22, 2012

    I have a Casio Fx-4500 since 20 years ago. I opened it as you said. It is all right. Thanks man & Good Luck

  • Rob Weemhoff Jan 24, 2013

    Yes, that worked. Please be aware there are 7 black screws

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Hi I have the same calculator..and have the same problem..but it still works Ok..what ever you do DONT hit the RESET button you will loose your Programs..also dont replace both batteries at the same time...

Posted on Jan 17, 2010

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Helps a lot. just remove the back cover and clean the two parts.

Posted on Sep 09, 2017

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Contrast Fx-4500 is low : I change the batteries but the contrast is low . plz help me

Posted on Sep 18, 2014

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Posted on Jan 02, 2017

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1 Answer

Installing new battery


Turn the calculator over. Look for some small screws that fasten a 1 or cover to the body of the calculator. Loosen the screws and remove cover. You should find button cell batteries. Before removing them make a note of the sign you see on the batteries (+ or -) while they still in place. Replace the batteries with the same model or equivalent ones. Replace the cover.
For more detailed instructions consult your calculator's manual.

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Checking the batteries is the first thing one should try. It is possible that for some reason the screen may be too dim.
Reset the calculator by pressing the button on the back. The screen should show the menus. To adjust the contrast you must press the E key (no need to press the ALPHA key for that.) then press F1 to access the contrast setting feature. Press the Right pointing arrow to increase the contrast.

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Casio Classpad 330 batteries run out very easily.


This may or may not solve your problem but it might alleviate it. The calculator has a power saving mode which you can configure as follows.
Turn ClassPad ON
Tap the Menu icon at the bottom of the screen.
Scroll down until you see the System Icon
4_25_2012_10_00_05_pm.png
Tap the system icon. After a few moments the calculator comes back and displays the system configuration screen.
At the top of the system configuration screen tap the battery icon (look for a + - sign).
This opens the power saving properties.
The power Save Mode will turn power saving mode automatically, after a day, one week or one month. It can also turn the power Save Mode OFF.

4_25_2012_10_01_55_pm.jpg

The other configurable setting is the auto Power OFF. It turns the calculator OFF after 1 min, 3 min, 6 min or 60 minutes.

4_25_2012_10_05_38_pm.jpg
.
Note: another possibility is the use of rechargeable NiMH batteries. Be aware that some manufacturers discourage strongly the use of rechargeable batteries.

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Easy low bat???


On the back upper right is a cover held in place with a screw. You will need a small screw driver to take off the cover. LR44 battery - one needed
With the new battery it is highly recommended to wife it off with a soft cloth first and then place it into the calculator and replce the cover.
NEXT VERY IMPORTANT press the following buttons to turn on for the first time.
Press "ON" "Shift" "9" "3" "="
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Seems to be a common problem on this otherwise great calculator that helped me through both high school and university. I've had mine for nearly 20 years and this problem showed up a few years ago. But I remember classmates reported the same problem when it was almost new.

If replacing batteries isn't helping, the problem is most likely caused by oxidation on the springs connecting the battery holder to the main PCB. The solution is as follows:

1. Remove the metal back cover (2 screws)
2. Remove the plastic back lid by removing the black screws (leave the batteries mounted) and CAREFULLY slide the back lid to the lower end (where the EXE button is located). Do not lift while sliding until the lid easily comes off.
3. On the back side of the plastic lid, very carefully bend the the two metal connectors ~1 mm on both batteryholders to increase their tension.
4. Clean the connecting pads on the PCB and the metal springs with de-oxidizer solvent.
5. Re-assemble and your 4500P calculator should be good as new.

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