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Old 01-09-2012, 06:36 PM   #21
Coltf1991
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Default Re: Battery Question

Is your charger an automatic charger?
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Old 01-09-2012, 07:15 PM   #22
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Default Re: Battery Question

Quote:
Originally Posted by Coltf1991 View Post
Is your charger an automatic charger?
No it's not an automatic charger.

I just bought a didgital volt meter. I'll check it in a few to give ya'll some true readings.
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Old 01-09-2012, 07:22 PM   #23
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Default Re: Battery Question

You said the charger was still at 10 when you took it off? 10 amperes? If so, why did you unplug it?
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Old 01-09-2012, 07:32 PM   #24
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Default Re: Battery Question

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Originally Posted by Coltf1991 View Post
You said the charger was still at 10 when you took it off? 10 amperes? If so, why did you unplug it?
Batteries sounded like they were "boiling". I could hear it standing about 5' away. I didn't think it sounded "good". This charging batteries thing is new to me.
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Old 01-09-2012, 07:59 PM   #25
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Default Re: Battery Question

Just checked each battery.

4V
6.2V
6.09V
6.36V
6.03V
6.26V

That's not doing anything to them since unplugging the charger down to 10amps about 24hrs ago
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Old 01-09-2012, 10:10 PM   #26
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Default Re: Battery Question

You have a battery with a bad cell. It's gonna sound like your batteries are boiling that is what they do when they are gassing.
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Old 01-09-2012, 10:26 PM   #27
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Default Re: Battery Question

Is there anything to do to fix that dead cell?
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Old 01-09-2012, 10:56 PM   #28
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Default Re: Battery Question

Does the Epsom Salt trick work?
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Old 01-10-2012, 01:32 AM   #29
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Default Re: Battery Question

Not on dead cells. Only against sulfation.
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Old 01-10-2012, 07:57 AM   #30
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Default Re: Battery Question

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Originally Posted by pearmanbryan View Post
JohnnieB,
I unplugged the charger when I heard the batteries "boiling". It was still at 10. I waited a little bit then opened all the caps. Water level was "ok" in them except for one. It was about 1/16" below top of plate. I'm getting some distilled water tonight and add to them. Then put back on charge. Should the needle on the charger go all the way down to the green area? Is that a "full" charge?
The "boiling" you hear is called gassing and is normal. Technically, it is the water (H2O) in the electrolyte solution breaking down into its component parts, Hydrogen and Oxygen, which is known to geeks and nerds like me, as electrolysis. Electrolysis occurs whenever electricity is passed through water, but it only gets intense or rapid enough for gas bubbles to form, break away from the plates and rise to the surface during the last 10%, or so, of the charge cycle, which is from about 90% SoC upwards rather than being a time related measurement.

Gassing uses water, so the water must be replaced. Here is a a Trojan Battery tech-mote on watering:
http://www.trojanbattery.com/Battery...ngDiagram.aspx

The ammeter on a charger only tells you how many Amps are flowing. I don't know where the green scale begins or ends on a Lester 8714, but color coded scales are more or less meaningless, it is the numbers that are important. With a good set of 225AH batteries that are less than 50% discharged, the ammeter should jump to about 25A and stay there up to about half an hour. Then it will begin tapering off to about 2-8A and stay in that approximate flow rate range until batteries are fully charged.

Fully charged is somewhat ambiguous term that is generally taken to mean when an automatic charger shuts off, which typically equates to the charger sensing an on-charge voltage in the 44-46V range for a 36V charger. Technically, fully charged means when the batteries on-charge voltage and/or specific Gravity of the electrolyte ceases to rise or increase.

With a manual charger, you have to set how long you want the batteries to charge on the timer and you want to charge then until the on-charge voltage measures about 46V. It'll take some trial and error, to figure out how many hours are needed when the batteries are down the 60% SoC versus when they are only down to 80% SoC, but both batteries and charger are fairly forgiving, so about all couple extra hours on charge will do is convert more water to hydrogen and oxygen.

BTW: Hydrogen and Oxygen gases form an explosive mixture, so no sparks or flames around batteries while charging, and wear a face shield (or at least safety glasses) and skin protection while working under the seat.

I suspected you had a bad battery when you said one battery was 20V and the rest were 30V in you earlier post, but now we know for sure.

One battery has a shorted cell;
One is good;
Two are marginal.
Two are beyond their useful life.

4V = Shorted cell
6.2V = 70%
6.09V = 50%
6.36V = 98%
6.03V = 50%
6.26V = 80%

You need a new set of batteries, but if you can accept less than optimal performance and can find some good used batteries of similar age and type, you might get away for a few months or maybe a year or so, with just replacing the worst three. Of course, you can replace the three bad batteries with new ones, but the battery pack will be limited by the weakest battery and the new ones will soon degrade to the level of the weaker batteries.
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