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Old 04-13-2013, 05:18 PM   #1
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Need battery expert

HI:

I have the usual arrangement of (4) 6 Volt house batteries, first two of them are connected in series to give 12 volts, the other two the same.

Then each pair of 12 volt bats are connected in parallel to give double the amp hours.

The problem is that one (and ONLY one) boils off liquid at a pretty good rate, while the other 3 lose almost no electrolyte at all.

I assume this indicates something wrong with the one battery like an internal short or something of that sort.

Am I wrong? Anything else I should look at??

Boowho??
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Old 04-13-2013, 05:24 PM   #2
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Check for a dead cell or poor connection. Other than that, change the position of that battery in the line up and see it is still the same battery that boils water. If not, there is a setup problem, it it is the same batt then get a replacement.
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Old 04-13-2013, 05:27 PM   #3
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How do you have the charger set up on them? You should have it set up so the positive is off the first battery and the beget ice should be off the last battery. This charges and draws voltage off all the batteries at the same amount.
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Old 04-13-2013, 05:30 PM   #4
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Where in the battery order is that battery that boils off liquid the fastest?
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Old 04-13-2013, 05:30 PM   #5
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Do you loose fluid while charging or while using them?
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Old 04-13-2013, 05:44 PM   #6
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have the battery tested, first you can do a specific gravity test, if ok - which I doubt, then load test. I'll bet you have a bad cell. It won't matter what position it's in, it'll still boil off.
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Old 04-13-2013, 05:59 PM   #7
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boowho,
Page 17 of this manual from Trojan describes some troubleshooting techniques, including how to measure specific gravity as mentioned above.
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Old 04-13-2013, 06:27 PM   #8
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Beget ice = negative. Damn auto correct.
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Old 04-13-2013, 06:34 PM   #9
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Quote:
Originally Posted by boowho View Post
HI:

I have the usual arrangement of (4) 6 Volt house batteries, first two of them are connected in series to give 12 volts, the other two the same.

Then each pair of 12 volt bats are connected in parallel to give double the amp hours.

The problem is that one (and ONLY one) boils off liquid at a pretty good rate, while the other 3 lose almost no electrolyte at all.

I assume this indicates something wrong with the one battery like an internal short or something of that sort.

Am I wrong? Anything else I should look at??

Boowho??
Sounds like the one battery is cooked, literally. You could remove it and have a battery distributor do a load test on it as suggested. My guess is you need to have the one renewed at least, many others will say they should be changed together as an equal set. Worst can happed the battery will fail and you'll be down to one bank. Maybe start with the test? A lot will depend on how old and heavily used.
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Old 04-13-2013, 06:42 PM   #10
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Bad cell would use less water methinks, so sump ting else is happening, but testing is the only way to figure it out.
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