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Supercapacitors/EDLCs...why are they failing?

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    Supercapacitors/EDLCs...why are they failing?

    After reading https://www.badcaps.net/forum/showthread.php?t=72162 it seems that supercapacitors simply do not last that long...

    ... or is it that it's being design-abused? Did Fluke mess up on this design?

    Supercapacitors/EDLCs used as memory storage maintainers are presumptively used so that the cost/annoyance of swapping batteries are done away with. As a capacitor it should have long charge/discharge endurance, though supercapacitors not as much as a regular capacitor, but does it have significantly larger cycle counts compared to a, say, LiFePO4 battery?

    Compare it to those tiny leakbomb Varta or other brand 3.6V NiCd/NiMH batteries used frequently on old motherboards versus an EDLC, which lasts longer before they become unusable?

    Are there other devices that frequently have their EDLCs fail? I don't have a Fluke DMM and don't know if I have devices with EDLCs... I did extract a small EDLC (0.047F) from some device and it still seems to work, so they're not extremely fragile AFAIK...

    #2
    Re: Supercapacitors/EDLCs...why are they failing?

    they failed on VCR's a lot

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      #3
      Re: Supercapacitors/EDLCs...why are they failing?

      It must be something wrong with the implementation:
      Siemens uses them in their 840D PLC units as a backup for the 3v lithium battery (so you have like 20 mins to replace it with the power off)
      I've never seen one fail: and some are 20+ years old...

      But I agree with STJ: seen them failed in home entertainment receivers myself.
      And the many examples of Xbox and Fluke's on this site...
      "The one who says it cannot be done should never interrupt the one who is doing it."

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        #4
        Re: Supercapacitors/EDLCs...why are they failing?

        OG Xbox is probably the most well known example of supercaps failing.

        Apparently Aerogel technology didn't age well, at all.
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          #5
          Re: Supercapacitors/EDLCs...why are they failing?

          To be fair, regular 2001-era capacitor technology didn't age well either. If you had an MSI board back then you were lucky it lasted two years as they were full of Chhsi junk. Even uber-expensive servers didn't get away from it when their Nichicon HMs started taking a dump. Need I mention KZGs?

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            #6
            Re: Supercapacitors/EDLCs...why are they failing?

            I would imagine that EDLCs would be formulated differently than regular capacitors... and were there any off brand EDLCs that weren't mostly Panasonic out there?

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              #7
              Re: Supercapacitors/EDLCs...why are they failing?

              lots of companies made them at one time or another,
              the oldest i'v seen are from 1987 on sega arcade boards - those ones never leaked.
              but those ones had thick steel cases - whoever made them obviously knew something!

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                #8
                Re: Supercapacitors/EDLCs...why are they failing?

                I remember those being NEC/Tokin caps (the same company that made those horribly unreliable caps in PS3s and some laptops). They were also larger than modern style caps of the same value.

                It looks like Kemet is selling them now.
                https://www.digikey.com/en/products/...H105ZF/4290877

                Comment


                  #9
                  Re: Supercapacitors/EDLCs...why are they failing?

                  NEC, Elna, Tokin, Samsung - like i said, everybody made them for a while but most stopped because they didnt get huge use

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                    #10
                    Re: Supercapacitors/EDLCs...why are they failing?

                    CapXon?

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                      #11
                      Re: Supercapacitors/EDLCs...why are they failing?

                      Originally posted by eccerr0r View Post
                      CapXon?
                      maybe now, but not back when i first started seeing them.

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