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My house banks is 4 Exide GC -110 batteries. They are ~6 years old. One of them is failing. The buildup in the pic suggests it has a crack in the case where corrosive gas is escaping.



The bank is functioning well otherwise.

Is it OK to replace the one battery that is failing? If so is there anything that I need to do to "equalize" or "re balance" them?

Or must I bite the bullet and replace all 4 at once?


 

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I faced almost exactly the same decision several months ago. My almost 8-year old T-105s were beginning to fail. These batteries have been babied since new, with frequent measurements, excellent charging & care. I have six of them in the house bank.

One of the six batteries began to lose capacity...almost one-third.....for no apparent reason. After contemplating finding a used golf-cart battery to replace the failing one -- mostly for research purposes --I decided to just remove that battery and it's paired one from the house bank array, thus leaving four batteries in the bank for several months. I watched them carefully.

Sure enough, after about 3 months two more batteries began to lose capacity. It was time to replace the whole lot of them.

After some research I decided to try Crown golf-cart batteries. Well built to industrial specs in the U.S. and considerably cheaper than T-105s. That was a few months ago. So far so good.

I'll know the outcome sometime in the next six or seven years :)

Bill
 

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Bummer. I'm sure it's time for a full new bank. Six years is average. You might have done better, but not by more than a couple of years, unless you were just OCD about charging and maintenance.

Are Exide's AGMs?
 

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it is OK to replace just the 1 battery (I know this will be like heresay)

But don't be surprised if the other 3 fail fairly soon and in the end you spend the same amount of money, but a lot more time. But hey, maybe you can get another year out of the others first.
 

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We just went through the same routine with 4 T-105's last July. One fried and 3 seeming to be okay. After discussions with Maine Sail, I pulled all four and turned them in, replacing them with 4 new. The Gulf Cart shop put a load tester on the 3 "good" batteries and all three proved to be very weak. Fortunately for us, Gulf Cart's and their batteries are so ubiquitous in Florida, replacement T-105's were only $105.00 each. One "trick" the technician at the shop instructed me on was to change the order of the batteries in the bank every 6 months so that the first battery (that closest to and attached to the charging source output) becomes that last (furthest from the charging source) and each battery in the bank moves up one position. Rather a lot of work but if it preserves the batteries better, rather worth the effort I suspect.

FWIW...
 

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One "trick" the technician at the shop instructed me on was to change the order of the batteries in the bank every 6 months so that the first battery (that closest to and attached to the charging source output) becomes that last (furthest from the charging source) and each battery in the bank moves up one position. Rather a lot of work but if it preserves the batteries better, rather worth the effort I suspect.

FWIW...
With a properly wired battery bank this isn't necessary. Properly wired the negative is from one end of the bank and the positive from the other. This draws across the bank evenly as shown below.
 

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