steve m
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| posted on 16/9/12 at 08:09 PM |
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Rejuvenaiting an 12 battery
I have an unused 12v jaguar xk8 battery, that has never been in a car,
plan is to use it as a caravan 12v supply
So far it has not responded to a trickle charge, or a jump off the mondeo
is it fooked !!
Steve
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David Jenkins
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| posted on 16/9/12 at 08:25 PM |
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Probably - a car battery can expire over time if it's not used and kept properly charged.
A car battery is also rubbish as a 12v supply - they don't like being discharged over a long period (you want a proper deep-discharge battery
for that).
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Bluemoon
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| posted on 16/9/12 at 08:27 PM |
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Probably dead, what is the voltage of the cells without load, if it's 12V or more you stand some chance. You also don't really expect
good service from a car battery when used for deep discharge such as a caravan (car batteries don't like being discharged!)..
Dan
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designer
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| posted on 16/9/12 at 08:29 PM |
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You need a 'leisure' battery to provide a power supply for a caravan.
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steve m
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| posted on 16/9/12 at 08:33 PM |
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I know i need a leisure battery, but we have just part exed the old caravan, and they are not having my new £120 battery!
so i was trying, to use "one in stock" just to part ex
Steve
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bi22le
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| posted on 16/9/12 at 09:23 PM |
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Is a sealed non serviceable one? You maybe able to test the cells with chemical pupet thingy and or change some liquid.
I use to "drop test" the old car batteries. Basically i used a snap on battery tester and shorted out the terminals untill i lost my
nerve. It shapes up the liquid and often brought it back to life.
They have also exploded in the post straying liquid everywhere. Be careful!!!
Track days ARE the best thing since sliced bread, until I get a supercharger that is!
Please read my ring story:
http://www.locostbuilders.co.uk/forum/13/viewthread.php?tid=139152&page=1
Me doing a sub 56sec lap around Brands Indy. I need a geo set up! http://www.youtube.com/watch?v=EHksfvIGB3I
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pmc_3
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| posted on 16/9/12 at 09:26 PM |
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I had one that was completely flat, intelligent charger/maintainer said it was dead stuck it on an basic old charger and charged up fine.
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NigeEss
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| posted on 16/9/12 at 09:47 PM |
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Adding some Ethylenediaminetetraacetic acid (commonly known as EDTA) into the cells
can break down the lead sulphate build up and give some extra life. But if the plates have
warped and are touching each other then it's fubared. Sadly this is likely to be the case.
Time is an illusion. Lunchtime doubly so.................Douglas Adams.
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britishtrident
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| posted on 16/9/12 at 10:08 PM |
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Even bog standard lead-acid chemistry batteries won't take a charge if truly dead flat they fight the currrent getting pumped in often need to
be connected for several hours (12+) to a standard charger before the internal resistance comes down far enough for the battery to start to slowly
take charge.
Most smart battery chargers won't look work on dead flat batteries.
Of course modern enhanced chemistry batteries won't accept charge easily if dead flat anyway.
[I] “ What use our work, Bennet, if we cannot care for those we love? .”
― From BBC TV/Amazon's Ripper Street.
[/I]
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ReMan
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| posted on 17/9/12 at 06:24 AM |
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How old and unused is it ?
Are we talking months years or decades?
As mentioned it may need to sit on an old fasioned charger for a good while before anything starts to happen?
I'm of the "I have one in stock" camp too , if you can get it going 
www.plusnine.co.uk
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cliftyhanger
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| posted on 17/9/12 at 06:32 AM |
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otherwise down to the scrappy and get the cheapest battery they have. Bear in mind they fetch a few bob in scrap these days too.....
Or if your car battery is getting long n the tooth/not as good as it was buy a new one for the car and pop the old one in the van.
edit. Or try fleabay. Cheap batteries turn up locally, probably get one for less than scrap value (seems to be £5-10 last time I took one in)
[Edited on 17/9/12 by cliftyhanger]
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motorcycle_mayhem
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| posted on 17/9/12 at 08:21 AM |
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Your battery will be a brick of lead sulphate, if it's been dormant and discharged for a length of time.
EDTA will 'revive' a lightly sulphated battery, but it's unlikely given the high impedance you clearly have, i.e it's dead.
Weigh in your lead sulphate brick and buy a new one.
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Peteff
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| posted on 17/9/12 at 08:45 AM |
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My optimate charger revived a battery which I had replaced on my Nissan van and it ran on my daughter's Corsa for a couple of years and was
still working when it was sold.
yours, Pete
I went into the RSPCA office the other day. It was so small you could hardly swing a cat in there.
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40inches
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| posted on 17/9/12 at 09:29 PM |
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I let the bike battery on the MK run flat last winter, a tip on a bike forum was to "flash" the positive battery terminal with
a car charger, up to 10 times, then connect an Optimate type charger. And it worked. Although it doesn't hold a charge for more than a couple of
days.
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ReMan
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| posted on 17/9/12 at 09:48 PM |
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Bike batteries are a LOT less tolerant to sitting doing nothing.
Presume to the small size means that the plates fur a lot easier
www.plusnine.co.uk
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