Question about Casio Office Equipment & Supplies

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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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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.
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