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 > Battery Question, Again

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Katdaddy

Petal, MS USA

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Posted: 06/17/18 07:21pm Link  |  Quote  |  Print  |  Notify Moderator

Folks I come to you, hat in hand again to try to help me understand what is going on with my batteries. I have four 6 volt batteries in my camper. I bought new batteries in September last year. I brought them home and hooked them up to a dedicated charger to bring them up to full charge. We took a trip to Cades Cove in October. Last time I bought new batteries I stupidly left them on a float charge for an extended period and lost capacity. This time I have run then through a cycle ever month to six weeks. We took another trip to the Cove last month and when I checked the batteries they were only at 80%. I have a Boondocker converter/charger and I have checked it when I first plug back in and it is reading 14.15 volts.The batteries are dated 7/17. Any ideas or suggestions are most welcome.


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donn0128

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Posted: 06/17/18 07:24pm Link  |  Quote  |  Print  |  Notify Moderator

How are you checking them? A real honest to goodness load test should tell you about their actual state.


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Katdaddy

Petal, MS USA

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Posted: 06/17/18 07:41pm Link  |  Quote  |  Print  |  Notify Moderator

Checking with a digital voltmeter.

ScottG

Bothell Wa.

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Posted: 06/17/18 07:54pm Link  |  Quote  |  Print  |  Notify Moderator

Have you checked them separately?
I'm wondering if you have a shorted cell in one.


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pauldub

North of Seattle

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Posted: 06/17/18 07:55pm Link  |  Quote  |  Print  |  Notify Moderator

To assess state of charge based upon voltage, you need to do so when no load or charging has been applied for several hours.

Katdaddy

Petal, MS USA

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Posted: 06/17/18 07:57pm Link  |  Quote  |  Print  |  Notify Moderator

pauldub wrote:

To assess state of charge based upon voltage, you need to do so when no load or charging has been applied for several hours.


That is how I checked them.

time2roll

Southern California

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Posted: 06/17/18 08:02pm Link  |  Quote  |  Print  |  Notify Moderator

What dedicated charger are you using?
What is the float voltage after a week?
Have you checked with a hydrometer when you think they are at 100%?


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Katdaddy

Petal, MS USA

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Posted: 06/17/18 08:14pm Link  |  Quote  |  Print  |  Notify Moderator

Genius G7200 charger,
I haven't check voltage after a week. A couple days is the longest I have allowed them to sit before checking.
I bought a hydrometer. I believe it to be ****. It says every battery I own is bad. Even two brand new batteries I bought for truck.

BFL13

Victoria, BC

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Posted: 06/17/18 08:48pm Link  |  Quote  |  Print  |  Notify Moderator

I am thinking your deep cycling every month is correct procedure, but you did not bring them back up to proper 100% full each time, not having an hydrometer to tell you when that was.

Result is undercharging after each cycle and consequent sulphation.

You need a charger that can stay at 14.8 all the way till they are fully charged as seen by hydrometer. Your converter can't do that. I don't know if your 7200 can. Now they are sulphated, after you get them to full, you need to get them to 16v for a good desulphating overcharge.

Your new hydrometer might be telling the truth, but if that one is not a glass one with the float bobber, like one of those sideways pointer plastic things that are hard to read, get the bobber kind and try that. $10 ? Good enough to tell you what's what.


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Katdaddy

Petal, MS USA

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Posted: 06/17/18 08:54pm Link  |  Quote  |  Print  |  Notify Moderator

This charger is supposed to be a smart charger and has a repair cycle. I have run the batteries through the repair cycle twice, with no apparent luck. The hydrometer is a glass model with the float.

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