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Old 06-13-2013, 01:11 PM   #1
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Question One bad battery...

In watering the house batteries in our coach, I noticed that I was putting a really large amount of water in one of them. Then I noticed that water was running out under the battery compartment at about the same rate I was filling. Hmmm.. Of course, one cell was leaking.

Our house battery bank consists of four golf cart batteries, which appear fairly new. So, question is: can I just replace the leaker with a new one of the same size, or should I replace all four? Obviously, golf cart batteries are fairly expensive to replace all four. I have load tested the other three batteries, and they seem in good condition.
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Old 06-13-2013, 01:13 PM   #2
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well you might be able to reseal it with something. or just buy a new one.it should be fine mixing a new one with the old ones
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Old 06-13-2013, 02:27 PM   #3
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Any idea why the battery case developed a crack/leak? There is likely a date or date code on the batteries. If several years old I would replace all. If in fact recent, replace one is ok - but I would do a specific gravity check and breakdown voltage check to ensure others the are ok.
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Old 06-13-2013, 02:51 PM   #4
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Hi Automobilist,
Try replacing the bad battery with one the same capacity. My suggestion is based on the OP stating the load test on the other batteries is good.
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Old 06-13-2013, 03:08 PM   #5
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Quote:
Originally Posted by Automobilist View Post
In watering the house batteries in our coach, I noticed that I was putting a really large amount of water in one of them. Then I noticed that water was running out under the battery compartment at about the same rate I was filling. Hmmm.. Of course, one cell was leaking.

Our house battery bank consists of four golf cart batteries, which appear fairly new. So, question is: can I just replace the leaker with a new one of the same size, or should I replace all four? Obviously, golf cart batteries are fairly expensive to replace all four. I have load tested the other three batteries, and they seem in good condition.
I would load test all the other batteries and if they pass, just replace the leaking battery. Just to be safe, I really believe you should load test the others prior to installing a new battery in that bank. All the best sir.
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Old 06-13-2013, 03:10 PM   #6
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calhyatt,
The OP mentioned he has already load tested the other 3 batteries.
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Old 06-13-2013, 05:02 PM   #7
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You can change only one, but your total A/H capacity will still be only as good as your wekest battery x 4.
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Old 06-13-2013, 07:30 PM   #8
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calhyatt,
The OP mentioned he has already load tested the other 3 batteries.
Missed that when I read his post. Ooops
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Old 06-13-2013, 10:08 PM   #9
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The new battery will be drawn down and equalize to the other batteries. If they load test OK, that won't harm the new battery at all. You probably won't notice any difference in operation at all.

It's like a 4-1.5V cell flashlight. If you replace one battery out of the group, that won't damage the new battery UNLESS the other three (or even one of the other three) is/are in bad shape. Let's say that they are all reading 1.45V after a year of sitting in the flashlight. The new battery reads 1.56V. In short order it will be reading 1.45V. And you'll still get many months of good operation out of them. Now, consider one of the four is reading 1.0V. That's not good. It'll draw the new battery down to 1.0V in short order and cause an early death.

Same thing with wet cell batteries...sort of. Simple...sort of.
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Old 06-14-2013, 12:07 AM   #10
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Ok, thanks for the input. Have a good local source of batteries for $80/each, so I'll give it a try.
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Old 06-14-2013, 08:09 AM   #11
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Maybe you have already done this, but I recommend that you track down the electrolyte leak and neutralize its trail when replacing the battery. My DP has some expensive electrical relays under the battery compartment.
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Old 06-14-2013, 10:59 AM   #12
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Maybe you have already done this, but I recommend that you track down the electrolyte leak and neutralize its trail when replacing the battery. My DP has some expensive electrical relays under the battery compartment.

Very good point. Fortunately, there is nothing beneath the battery tray.
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