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Old 31-08-2019, 12:17   #1
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6v 8GGC2 Battery - is this Gel Cell?

Hi,

We have these batteries in series-parallel (2 banks or 2x6v) :

https://www.mkbattery.com/applicatio...Spec-Sheet.pdf

The model is 8GGC2 - the spec sheet says they are valve regulated gelled electrolyte battery, is that a flash word for Gel Cell?

Our specific ones are labelled as Endurant brand, but the model number and physical housing looks the same - do companies rebrand batteries?

What is a charged voltage for 2 x 6v batteries? 13.2v? I can'f find it on there website.
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Old 31-08-2019, 15:25   #2
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Re: 6v 8GGC2 Battery - is this Gel Cell?

Yes GEL by East Penn aka EPM Deka

Datasheet:
http://www.eastpennmanufacturing.com...eters-1913.pdf

Developed by Sonnenschein, nearly as good.

Low charge rate, takes 7+ hours to get from depleted to Full, stop at endAmps .005C, at least 12.85V at rest.

Can last a **very** long time if well coddled, kept cool.

Can go below 50% DoD if needed, but better longevity if you don't.
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Old 31-08-2019, 23:45   #3
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Re: 6v 8GGC2 Battery - is this Gel Cell?

Quote:
Originally Posted by john61ct View Post
Yes GEL by East Penn aka EPM Deka

Datasheet:
http://www.eastpennmanufacturing.com...eters-1913.pdf

Developed by Sonnenschein, nearly as good.

Low charge rate, takes 7+ hours to get from depleted to Full, stop at endAmps .005C, at least 12.85V at rest.

Can last a **very** long time if well coddled, kept cool.

Can go below 50% DoD if needed, but better longevity if you don't.
So a healthy charge voltage for a 6v then is about 6.4 - 6.45? (I am trying to resuce a battery that went to 4v)

Any idea what the significance of the top wall being deformed?
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Old 01-09-2019, 00:14   #4
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Re: 6v 8GGC2 Battery - is this Gel Cell?

That battery is toast. Probably a shorted cell.
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Old 01-09-2019, 00:15   #5
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Re: 6v 8GGC2 Battery - is this Gel Cell?

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That battery is toast. Probably a shorted cell.
Why do cells short?
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Old 01-09-2019, 00:58   #6
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Re: 6v 8GGC2 Battery - is this Gel Cell?

Various causes, mechanical and electrical. See https://batteryuniversity.com/learn/...internal_short
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Old 01-09-2019, 03:13   #7
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Re: 6v 8GGC2 Battery - is this Gel Cell?

Quote:
Originally Posted by john61ct View Post
Yes GEL by East Penn aka EPM Deka

Datasheet:
http://www.eastpennmanufacturing.com...eters-1913.pdf

Developed by Sonnenschein, nearly as good.

Low charge rate, takes 7+ hours to get from depleted to Full, stop at endAmps .005C, at least 12.85V at rest.

Can last a **very** long time if well coddled, kept cool.

Can go below 50% DoD if needed, but better longevity if you don't.
Do you realize that the advice you gave about when to terminate absorption is completely counter to the EPM spec sheet that you provided?

To the OP, that's a sealed battery with valves to serve as pressure relief devices. I won't speculate as to what caused the high internal pressure that's caused the bulge but it's most likely at end of life.

If you're hell-bent on trying to rescue it take it off the boat, charging as a 6v, take it to 7.1 to 7.2v until the current acceptance stops dropping or 12 hours whichever comes first. But take it off the boat, that case is compromised and the end result could be nasty. Wear eye protection at a minimum.
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Old 01-09-2019, 06:07   #8
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Re: 6v 8GGC2 Battery - is this Gel Cell?

Sorry I was not more clear, I was addressing the general query about the nature of the batteries and their care requirements.

Not the situation with this specific set.

As for the "conflict" in charge termination, there actually is none, why would you interpret it that way?

Either spec will do, the one I gave came from their manager of customer support since their published "rate of change" endAmps spec was impossible to automate for a customer.

OP, you should call or email your "Endurant" brand holder tech support about your admittedly bizarre issue, if the troubleshooting help you get here does not get you there.

If they are not responsive, call EPM at +1 (610) 682-6361 during business hours EST and ask for tech support, just pretend you bought their branded unit.
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Old 01-09-2019, 07:22   #9
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Re: 6v 8GGC2 Battery - is this Gel Cell?

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Originally Posted by john61ct View Post
Sorry I was not more clear, I was addressing the general query about the nature of the batteries and their care requirements.

Not the situation with this specific set.

As for the "conflict" in charge termination, there actually is none, why would you interpret it that way?

Either spec will do, the one I gave came from their manager of customer support since their published "rate of change" endAmps spec was impossible to automate for a customer.

OP, you should call or email your "Endurant" brand holder tech support about your admittedly bizarre issue, if the troubleshooting help you get here does not get you there.

If they are not responsive, call EPM at +1 (610) 682-6361 during business hours EST and ask for tech support, just pretend you bought their branded unit.
John,

I'm obviously not as steeped in battery technology as you, but I reckon that the same ammeter used to measure 0.005C might be able to measure a lack of decline in amps accepted. How hard is it to notice when the numbers stop changing?

I also believe that compromised battery will never achieve 0.005C. If it has a shorted cell you could push that gel into thermal runaway waiting for 0.005C. So following that incredibly difficult manufacturer's spec of stopping when the charging amps stop dropping seems not only to be the correct regime but also the safest.
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Old 01-09-2019, 09:16   #10
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Re: 6v 8GGC2 Battery - is this Gel Cell?

Yes with a properly working bank, if a human is the regulator, either way works fine.

As I stated I got the .005C spec from EPM when setting up **automated* charge regulation.

And, again, nothing I had written had anything to do with the fubar bank situation.
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Old 01-09-2019, 09:38   #11
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Re: 6v 8GGC2 Battery - is this Gel Cell?

John, you replied to the OP with a fubar battery what in God's name are you even saying. Sometimes I think you respond without even reading the post.
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Old 01-09-2019, 11:10   #12
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Re: 6v 8GGC2 Battery - is this Gel Cell?

Quote:
Originally Posted by kenbo View Post
I won't speculate as to what caused the high internal pressure that's caused the bulge but it's most likely at end of life.
Not sure if it makes any difference for the outlook of the battery, but its acutally not bulging, but a dip (or sunkeness) from the usual height of the top of the battery.

Have resigned to replacing the 4v battery - the one in the background (which also has some dipping) is at least still measuring 6.1v - hopefully this one is still ok.
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Old 01-09-2019, 11:21   #13
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Re: 6v 8GGC2 Battery - is this Gel Cell?

BigAl,

It was hard to tell from the photo but you could still charge each battery to 7.1-7.2v off the boat and see where that gets you. A good 6v battery should hold 6.3 after a full charge.
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Old 01-09-2019, 11:30   #14
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Re: 6v 8GGC2 Battery - is this Gel Cell?

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BigAl,

It was hard to tell from the photo but you could still charge each battery to 7.1-7.2v off the boat and see where that gets you. A good 6v battery should hold 6.3 after a full charge.
We did try to charge them in series @12v with a old school battery charger but would not accept any charge. IIRC someone said better to try each battery with a 6v charger? I will take to a battery place today.

I would love to know what caused this to the batteries that are less then 3 years old

What sort of enviromental temperature range can they operate in?
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Old 01-09-2019, 11:46   #15
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Re: 6v 8GGC2 Battery - is this Gel Cell?

Plate sulfation due to not being fully charged often enough is the usual suspect.
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