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Old 01-14-2013, 10:21 AM   #1
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Signs of a Bad battery?

A short history...

At the end of Summer 2011 I purchase my HTT, it came with a cheap-o Group 27. A couple weeks after the camper purchase I bought another cheap-o Group 27 and connected it, in parallel, with the original battery. They have always been wired in a set since I purchased the 2nd battery. I remove the neg connection whenever camper is in storage. In the winter I bring the set home, and every 3-6 weeks connect the set to my bulk (not a fancy 3-stage thingy) 10A charger for a few hours. The few times have have gone dry camping over the past 18 months, I connect my small Honda 700c genset to the camper for ~1 hour each day to keep the set topped off. 80% of our camping nights we have hook-ups.

Fast forward to this past week...

I purchases a Battery Tender to keep the set charged over the winter. I connected to the Tender to the set and after ~24 hours it was still in bulk charging mode, despite the fact that I had a couple of weeks earlier connected it to my cheap-o bulk charger.

At this point I separated the set and connected the Tender to original battery. 48+ hours later, the charger reached Stage II and less than 18 hours later the charger reached Stage III (final stage). The battery also "boiled over" a bit as well, but that might have been due to me adding water prior to the original charging (I have since read that you are not suppose to add water under the battery is charged).

I connected the Tender to the 2nd battery. In less than 18 hours it reached Stage III.

Should I be concerned that something is "wrong" or "gone bad" in the original battery?
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Old 01-14-2013, 10:35 AM   #2
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Sounds like the plates are sulfated.

Buy a charger/maintainer that desulfates your batteries.


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Old 01-14-2013, 10:37 AM   #3
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Such as http://batteryminders.com/


http://en.wikipedia.org/wiki/Lead%E2%80%93acid_battery


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Old 01-14-2013, 11:29 AM   #4
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Quote:
Originally Posted by f1100turbo View Post
Sounds like the plates are sulfated.
I didn't think of Sulfation as I always thought it is only an issue with "old" batteries.

Quote:
Batteries which have sat unused for long periods of time can be prime candidates for desulfation
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Old 01-14-2013, 11:40 AM   #5
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Originally Posted by BackInAction View Post
I didn't think of Sulfation as I always thought it is only an issue with "old" batteries.
Did you read sulfation /desulfation section of Wikipedia link?


Normal charging and discharging with induce sulfation.

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Old 01-14-2013, 11:44 AM   #6
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Most likely your use pattern has abused your batteries and they have prematurely aged. Here are some great sources and I suggest you pull down a few threads here on battery management.

Pay particular attention to the article on the Peukert Effect.
Attached Files
File Type: pdf Exide Golf Cart Battery Maintenance.pdf (3.04 MB, 36 views)
File Type: pdf Taking care of Deep Discharge Batteries.pdf (7.44 MB, 34 views)
File Type: pdf The 12 volt Side of Life.pdf (438.4 KB, 42 views)
File Type: pdf Trojan battery user guide.pdf (548.6 KB, 23 views)
File Type: pdf What is the Peukert Effect.pdf (164.4 KB, 39 views)
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Old 01-14-2013, 12:13 PM   #7
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(I have since read that you are not suppose to add water under the battery is charged).


Buy a gallon of distilled water at the supermarket.
That is on the only type of water for any lead acid battery.
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Old 01-14-2013, 12:24 PM   #8
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Yep, just topped my two deep cycles off with distilled water. Took awhile to find a place that stored the battery cables for parellel connection though...

How often are you guys checking the water in them - once a year?
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Old 01-14-2013, 12:29 PM   #9
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I made my own cables for the parallel setup (using 6 gauge wire). I have added water to the set twice. Once this past May, and again last week. I always use distilled water.
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Old 01-14-2013, 12:38 PM   #10
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Originally Posted by herk7769 View Post
Most likely your use pattern has abused your batteries and they have prematurely aged.
Could be, though I'm not sure why both batteries would not show the same signs.
Quote:
Pay particular attention to the article on the Peukert Effect.
Are you suggesting that I might have rapidly discharged the battery set too often? I suspose that is possible, but again, why is only one battery of the set showing signs?
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