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Post by Fox on May 9, 2012 17:38:45 GMT -5
I read a thread not too long ago where someone said that the automatic chargers get fooled by batteries sometimes so they won't take a charge. I wanna know what type charger to use when that happens cause I have tossed out at least 40 batteries over the years cause they wouldn't charge with the charger I have. I'm thinking I may have been able to save these batteries if I knew what type charger to use. I have one like this where you have to manually switch it from 6 to 12 volts but it does the rest automatically and some batteries won't charge with it.  I also have one like this one but I'm afraid it's going to boil the water out of the battery. "Battery Charger/Engine Starter, 10/2/55 Amp, 6/12 volt battery charger/engine starter, automatically switches to trickle charge when batteries are fully charged, self resetting circuit breaker, spark-proof"  |
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Post by Deleted on May 9, 2012 17:47:17 GMT -5
I use one specifically designed for motorcycle batteries. I had trouble with 2 Xtreme batteries....but they would not work on another charger either.
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Post by Deleted on May 9, 2012 17:48:30 GMT -5
You can use a battery tender Jr it comes with the aligator clips too. I have used it to charge batteries that were out of the bike this way also.  |
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Post by jmkjr72 on May 9, 2012 17:48:54 GMT -5
why buy a charger if you have a good battery in somehting
then you would hook the 2 batteries together and then hook the charger
the charger will not detect the very low battery but will detect that there is a battery that needs a charge
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Post by Fox on May 9, 2012 17:53:07 GMT -5
I have a battery out there now that gives me a reading of 11.57 volts with a meter. Hook it up to my charger and nothing happens. I suppose I could try hooking it to a second battery like you suggested.
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Post by Deleted on May 9, 2012 17:57:33 GMT -5
why buy a charger if you have a good battery in somehting then you would hook the 2 batteries together and then hook the charger the charger will not detect the very low battery but will detect that there is a battery that needs a charge is series or parallel? |
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Post by jmkjr72 on May 9, 2012 19:27:41 GMT -5
well if you put them in series you would no longer have 12 volts but 24 volts and the charger wont work
you have to hook them in parallel + to + and - to -
infact to save on buying chargers i hook more then 1 up in parallel in the winter
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Post by revweasel on May 9, 2012 19:53:29 GMT -5
why buy a charger if you have a good battery in somehting then you would hook the 2 batteries together and then hook the charger the charger will not detect the very low battery but will detect that there is a battery that needs a charge is series or parallel? PARALLEL!!!!! I have not really ever had much luck with that trick, worth a shot though. |
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Post by Deleted on May 9, 2012 19:55:36 GMT -5
PARALLEL!!!!! I have not really ever had much luck with that trick, worth a shot though. I see. You certainly are passionate about it lol. |
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Post by revweasel on May 9, 2012 20:33:22 GMT -5
just dont ant anyone getting hurt or even burning up chargers. i'm an electrical engineer... so if you see me say something about someones electrical idea, take heed.
i'm heading out to see if im better off with the .88 jet now! lets see if it breaks 41mph (it better cause its still slower than stock, quicker though!)
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Post by reveeen on May 10, 2012 6:10:18 GMT -5
You want an old type "dumb charger" delivering a low current (2 amps). A good source for these is yard sales.
(opening up the charger there will be a transformer, a rectifier (bridge), and maybe a capacitor, maybe a meter, but NO circuit board of any kind)
Sometimes you will get a stubborn one (a battery that has forgotten it is a battery) that can be tricked into working, or taking a charge, by hooking up a small load (a small 12V bulb) in parallel with the battery terminals while attempting a charge.
Even if you do get a questionable battery to take a charge (13+ volts) you should rest it for a few days, then re-check to see if it does hold the charge.
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Post by Fox on May 10, 2012 17:39:27 GMT -5
Okay. Finally an answer that makes sense. You're talking about one of those plug in chargers for a calculator or a telephone answering machine that puts out 12 volts @ 2 amps max. Those usually have a plug on the end and the wires are both black so how do you know which one is + ? EDIT: For shits and giggles I opened the cap on the battery and it looked dry so I added some acid to it and it's now taking a charge. We'll see in a while how much of a charge..  |
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