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Thread: Deep Cycle 12V Caravan Battery

  1. #1
    Bos
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    Deep Cycle 12V Caravan Battery

    I got given one of these the other day to compliment the 12v system we run in our hut. Problem is its dead flat and modern home-use battery chargers Ive tried dont like it
    Anyone know if this is recoverable or is it a visit to the scrap metal buyer
    Thanks

  2. #2
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    probably scrap, deep cycle do not like dropping too low in charge, meant to be kept topped up all the time, I have just replaced my caravan one, ouch!

  3. #3
    Member Sarvo's Avatar
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    Quote Originally Posted by Bos View Post
    I got given one of these the other day to compliment the 12v system we run in our hut. Problem is its dead flat and modern home-use battery chargers Ive tried dont like it
    Anyone know if this is recoverable or is it a visit to the scrap metal buyer
    Thanks
    You know where the scrap guy is in behind New World
    They buggered
    But still with taking to him as I have done with my ex Solar Banks

  4. #4
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    once they hit dead flat the plates are sulphated and they will never get back any significant capacity

  5. #5
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    If scrap is more than $1/kg then putting that money to a box of beer to drink while you think about buying a new battery is the best bet.

    Dead flat, as in... what voltage?
    Depending what you're expecting out of it, it COULD come back to some kind of life. As long as you accept that it's already dead and any time spent may be wasted. I would not add it to a battery bank (it will just drag the rest down) but if it was on it's own to run LED lights or something that be OK.

    As long as it hasn't dropped a cell, ie, you have over 10.5V, you could give it a bash.
    Check cells are topped up with water. Hook it in parallel with a good battery. While parralleld, connect charger red to pos on one battery and black to neg on the other, overnight. Disconnect, check voltage an hour later, if it's below 11.8 then quit, if it's come up 12.4+ then wire in and drive on.
    If you have access to a solar panel you can give it an "equalise" charge at about 16V - this boils sulfate off the plates and mixes up any acid stratification.
    hamsav and Micky Duck like this.
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  6. #6
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    Quote Originally Posted by ONYVA View Post
    probably scrap, deep cycle do not like dropping too low in charge, meant to be kept topped up all the time, I have just replaced my caravan one, ouch!
    How big and what did you pay, if I might ask
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  7. #7
    Member Phil_H's Avatar
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    Well all I can say is that it is a good thing that I hadn't read all these replies before I had our caravan battery revived.

    First time was about 4 years ago. Had it under cover and had left a light on inside. When we finally got to it some months later the battery appeared dead. Connected to my home charger and it told me that the battery was defective and wouldn't even try to put a charge into it. Took it to the local garage as a last resort. They put it on their commercial grade charger overnight and it was back to full in the morning.

    Then again, left the caravan under fabric cover for about 18 months.....same battery. The hope was that sufficient light would filter through the fabric to the solar panels to keep a minimal charge in the battery. Alas, when we removed the cover and tried the battery, again it appeared dead. Same story as above when I connected it to my home charger. Once more off to the local garage....different garage than last time. I explained the situation to him and he was sceptical, but to his credit agreed to give it a go. Once again, following morning and it is fully functional.

    The last time was approximately 6 weeks ago and all is still going OK.

    Moral of the story....indeed it may be stuffed....but what is there to lose by trying it on a commercial charger.

    Cheers
    Phil
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  8. #8
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    Quote Originally Posted by Bos View Post
    I got given one of these the other day to compliment the 12v system we run in our hut. Problem is its dead flat and modern home-use battery chargers Ive tried dont like it
    Anyone know if this is recoverable or is it a visit to the scrap metal buyer
    Thanks
    Try connecting it up to a small 12 volt trickle charger, One without the brain that tells itself the battery is fucked. After a day or two it may take just enough charge to then be recognised by the smart charger. Even try connecting it to a medium sized solar panel (50-100 watts).

    I have several car batteries that were classified as fucked, that I have running energisers around the farm. Connected up to a 120 watt panel with charge controller, they have worked fine for another 6 years. Still working today.

  9. #9
    Bos
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    Appreciate all the comments and advice.
    As it was given to me, got nothin to lose in trying to restore it.
    I was told that a 24v charge into it for the first 12 hours would restore it enough to then handle a 12 v charger. At any rate, I'll give a few of the above options a go and see what happens

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    Second XR500. Old school charger that doesn’t know it’s stuffed is the way to go.
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    Remember the 7 Ps; Pryor Preparation Prevents Piss Poor Performance.

  11. #11
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    You can blow the sulphide off by giving a blast of 240, but it isn't in any manuals and you need to know the supply protection as well.

    Old school wound chargers are where its at. The modern plug in and forget units, won't like it. Use a old one to bring it up, then plug in a new unit to keep it up.
    2post likes this.
    Please excuse spelling, as finger speed is sometimes behind brain spped........ Or maybe the other wayy.....

  12. #12
    I hunt, therefore I am.
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    Quote Originally Posted by Bos View Post
    Appreciate all the comments and advice.
    As it was given to me, got nothin to lose in trying to restore it.
    I was told that a 24v charge into it for the first 12 hours would restore it enough to then handle a 12 v charger. At any rate, I'll give a few of the above options a go and see what happens
    NO!

    if you do that, do it in the middle of a paddock and video it though!
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  13. #13
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    Quote Originally Posted by ONYVA View Post
    probably scrap, deep cycle do not like dropping too low in charge, meant to be kept topped up all the time, I have just replaced my caravan one, ouch!
    I thought that’s what deep cycle batteries were designed for, discharging a lot before recharging (though not discharged too low or left flat)

  14. #14
    Bos
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    Quote Originally Posted by mimms2 View Post
    NO!

    if you do that, do it in the middle of a paddock and video it though!
    OK Probably a "no" then
    Micky Duck likes this.

  15. #15
    northdude
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    Ive found that if you have a charger that has a supply voltage setting on it leaving a battery hooked up for a couple of hours on that setting has kicked them back into life most of the time after a couple of hours on the supply setting disconnect and charge as normal

 

 

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