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  1. #1
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    Default White deposit on negative terminal?

    Can the guru's please advise - What is the cause of a white deposit (powder) forming on the negative terminal on a battery?
    This is happening on my auxiliary batteries in the Isuzu.
    Is it a problem or should I just clean it off?
    What can I do to prevent it forming in the first place?
    Does it have any effect on the performance of the electrics?
    Peter Hutchison
    Answering the call of the wild is just so much beter than answering the telephone.
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    Default

    Quote Originally Posted by Peter1949 View Post
    Can the guru's please advise - What is the cause of a white deposit (powder) forming on the negative terminal on a battery?
    This is happening on my auxiliary batteries in the Isuzu.
    Is it a problem or should I just clean it off?
    What can I do to prevent it forming in the first place?
    Does it have any effect on the performance of the electrics?
    Mix a teaspoon of bicarb with a tablespoon of grease.
    Clean the terminals.
    Smear the muti on and it should not corrode again.

    .... or buy a tube of "No Corrode" or similar.

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  3. #3
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    Default Re: White deposit on negative terminal?

    Thanks 4e, I was wanting to know the cause and effect though.
    I will certainly clean it off. I like things to be working correctly and properly - that's just me.
    Peter Hutchison
    Answering the call of the wild is just so much beter than answering the telephone.
    [B][SIZE=2][FONT=Calibri][SIZE=2][B]ISUZU KB 280 DT LE
    Modified Glider Hunter trailer fitted with RTT.
    Platkar = Chevy Spark 1.2

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    Default Re: White deposit on negative terminal?

    I presume it's a lead acid battery? it's a reaction of the lead with the hydrochloric acid - a tiny amount will make it's way past the seal ESPECIALLY if the terminals are abused (i.e. tightened or loosened with a lot of force)

    um. I forget what it is. probably lead sulphate or sulphite or something like that, I know the reaction releases hydrogen from the sulphuric acid, which can go bang very easily.

    as 4e says.... Bicarb washes it off, and grease prevents it reforming.

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    Default Re: White deposit on negative terminal?


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  7. #6
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    Default Re: White deposit on negative terminal?

    Thank you all. Got it.
    Peter Hutchison
    Answering the call of the wild is just so much beter than answering the telephone.
    [B][SIZE=2][FONT=Calibri][SIZE=2][B]ISUZU KB 280 DT LE
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  8. #7
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    Default Re: White deposit on negative terminal?

    Enos then petroleum jelly
    There is no task too simple for some people to complicate !



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    Default Re: White deposit on negative terminal?

    I remember putting a 2 cent coin on the battery .All the acid would collect on the coin .When full of acid just turf the coin and replace with new one

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    Default Re: White deposit on negative terminal?

    Quote Originally Posted by smarty View Post
    I remember putting a 2 cent coin on the battery .All the acid would collect on the coin .When full of acid just turf the coin and replace with new one
    There must be cheaper ways....
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  12. #10
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    Default Re: White deposit on negative terminal?

    Guys a head scratcher here:

    Resurrecting this post, I have an Optima 48 Ah battery fitted to my gate motor. The gate motor started messing around this morning, indicating battery not fully charged.

    On inspection the battery, the negative (earth) pole was white with powder. I checked the charge voltage, 13.6 V. I disconnected the terminals, the battery showed 12.5 V.

    I did not have any Bicarb around, so I gave the terminal a good wire brush clean up, reconnected but the gate motor still gave the low battery alarm and only worked once. I checked the battery voltage again, still 12.5 V.

    Then I resorted to swapping the electric fence battery (exactly the same make and size battery). Before connecting I checked its voltage, 12.5 V.

    I connected, tested and problem gone! Bamboozles me how that was solved, but so be it. The other battery now connected to the electric fence.

    So why would the negative pole build up with powder, and not the positive, which is normally the case? Bad pole connection?

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    Default Re: White deposit on negative terminal?

    You need to do a load test to see how fast the voltage drops as far as I know.
    Jakes Louw
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    Default Re: White deposit on negative terminal?

    If the terminal is dry, sometimes corrosion builds up . Clean terminals with bicarb as stated in the thread earlier. Apply grease or Q20 and make sure the lug is also clean cut off and crimp new lug onto it and reconnect. M2cw

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  17. #13
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    Default Re: White deposit on negative terminal?

    I bet the battery is shot. Check the volt drop of the current battery when you open or close the gate. Now connect the old battery and repeat. Yu will probably see a much bigger volt drop
    Mike Lauterbach

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  19. #14
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    Default Re: White deposit on negative terminal?

    I've seen this alot on batteries of especially gate motors. No idea why the negative connection always does that. But DC is a strange thing. When n get callouts for gate motor issues it is usually dead batteries or corrosion on the negative terminal and the batteries dont last long after that
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  21. #15
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    Default Re: White deposit on negative terminal?

    Quote Originally Posted by mikeml View Post
    I bet the battery is shot. Check the volt drop of the current battery when you open or close the gate. Now connect the old battery and repeat. Yu will probably see a much bigger volt drop
    Spot on.
    I find it every day when gate PCBs miss behave that clients test either with the charger connected and/or on no load. As soon as a load is applied the batteries tend to collapse.
    Normal response is I did test while gate moving and I got a reading above 12V.
    Last edited by ekkekan; 2021/07/15 at 10:20 AM.

  22. #16
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    Default Re: White deposit on negative terminal?

    Interesting read on Battery terminal corrosion.

    https://www.caringlyyours.com/corros...tery-terminal/
    Jörg Reddig

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  24. #17
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    Default Re: White deposit on negative terminal?

    Quote Originally Posted by Peter1949 View Post
    Can the guru's please advise - What is the cause of a white deposit (powder) forming on the negative terminal on a battery?
    This is happening on my auxiliary batteries in the Isuzu.
    Is it a problem or should I just clean it off?
    What can I do to prevent it forming in the first place?
    Does it have any effect on the performance of the electrics?
    Pete I dont know what the cause is but I used to pour Hot water on the terminal which sorted it for months after

  25. #18
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    Default Re: White deposit on negative terminal?

    Without reading any of the links, my cruiser has a short somewhere and the battery cakes up in no time at all, never had this problem before the short.
    *** Removed ***

  26. #19
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    Default Re: White deposit on negative terminal?

    I noticed a build up on the neg terminal on a battery and nothing on positive. I also noticed and concluded that the negative terminal was weeping acid / leaking around the negative terminal.
    Peter
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  27. #20
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    Default Re: White deposit on negative terminal?

    This is a very old thread that has somehow been revitalized.

    However, whatever the cause, I have discovered that a little Coke poured over the terminal clears it quickly, rinse with some window spray or even water and some Q20 or similar seems to hold it at bay for a while.
    It seems that a slightly loose or cracked terminal clamp can also cause this. I don't actually think it is a battery acid leak issue.
    Anyway for the last couple of years I have no longer experienced this problem.
    Peter Hutchison
    Answering the call of the wild is just so much beter than answering the telephone.
    [B][SIZE=2][FONT=Calibri][SIZE=2][B]ISUZU KB 280 DT LE
    Modified Glider Hunter trailer fitted with RTT.
    Platkar = Chevy Spark 1.2

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