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Old 01-18-2011, 03:08 PM   #1
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Battery lost a cell. Desulfating or refurbishment possible?

I have 2 Interstate Megatron Marine Deepcycles as the Coach Batteries in my M/H. From the paperwork I got with the rig, looks like they are 3 years old.
Stupidly I left something on last month and deep discharged them down to dead.
I have no 120V at my storage, so pulled them off and recharged them at home using my new BatteryMINDER charger/desulfator.

One of them came back ok, and I just checked it after a week of resting here and it is reading 12.6V.
The other is not good, shows 10.5V and a check of the SG in all the cells tells me one is dead, and reads very low SG.

If I leave it on a Desulfating charge of 2A(Charger has 2A,4A, and 8A), is there any chance it will come back?
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Old 01-18-2011, 03:30 PM   #2
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NO. Sal.
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Old 01-18-2011, 03:43 PM   #3
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Ok, so let me get this straight...
If I just buy a replacement I am not "Matched" battery wise, so the new one will get pulled down to the older battery's level?
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Old 01-18-2011, 03:44 PM   #4
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More or less, that's correct
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Old 01-18-2011, 03:46 PM   #5
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Always replace in pairs:
1)if they are wired in parallel
2) are of significantly different age. That is maybemore than a year apart in birthdate. Also check the date codes when you buy 2 new. Try to get them within a couple of months production of each other.
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Old 01-18-2011, 04:30 PM   #6
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Ok, Thanks.

I have been doing some research, but am a little confused...
My reading indicate 1 cell that is not taking charge.
Now, I read that if the cell is "shorted", it will bubble more than the others and get hot?
This is not the case with my battery... the cell in question only bubbles a little, and far less than the others when i apply a heavier charge.

If I need to replace it, i will, but money is tight.
As i have some issues with my battery tray, and will need to repair it, I need to plan this new battery gig well.
The battery tray is 40"x15"x9".
Here is a photo:


I plan to remove the rearward tool storage bin to give me more space, then move the engine starter battery to the front.
As I need to cut out the whole floor, I am thinking drop the whole floor of the tray inboard of the body curve to give me space for more/ bigger batteries.

How deep are 6V's?
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Old 01-18-2011, 05:21 PM   #7
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Battery Problems

Isn't ownership of a RV FUN.

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Old 01-18-2011, 05:35 PM   #8
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First, your battery with 10 volts is a goner...It's 'shorted' internally, from either 'curd' piling up from the bottom of the case (unlikely), or a spot in a separator has worn through, allowing two adjoining plates to touch...in any event, there's nothing you can do to fix it at this stage...

If you wish to replace with the golf car style, 6 volt deep cycles, you'll need a bit more clearance on top, as they are about 2 inches taller than you 12 volt batteries - their 'footprint' is 10 x 7 inches - about the same length, but about 1/2 inch wider than the 12 volt's you now have..

The 6 volt batteries are a good choice if you need to run your 12 volt stuff for a longer period when off 'shore' power.
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Old 01-18-2011, 05:46 PM   #9
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Give the desulfation a chance to work. The cost is right. I had one battery that my charger and a battery minder both said was bad and needed replacement. I let a desulfate mode on a different charger run for about six days and the battery finally took a good charge. Voltage reading after removed from the charger for 10 days was 12.67.
I don't know how long it will last in use, but I plan to give it a good test.
You don't have anything to lose by giving it a try.
As for running different age batteries together ......... I have no idea.
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Old 01-18-2011, 05:50 PM   #10
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Quote:
Originally Posted by Keyair View Post
the cell in question only bubbles a little, and far less than the others when i apply a heavier charge.
Any battery with a bad cell that I ever had acted exactly as yours or that particular cell would not bubble at all.
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Old 01-18-2011, 06:01 PM   #11
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Battery

I would say, even if you got it back to fair SG with extended charging, and tried to use it with the other battery, your charge system would just work overtime from the heavy demand. That cell will never again charge as quickly as the other cells will.
Question is -- new batteries or new alternator?

The same thing can happen to 4 X 6V. Just ask me.
Out of the 4 X 6V I had, I picked the best pair, and used them on my home alarm system, charged with solar. I figure the alarm will run for about a week, before the Trojan T105's run down.
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Old 01-18-2011, 07:48 PM   #12
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Mexray is right.

If money is tight just scrap the bad battery and run with only one battery until you can afford replacements.
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Old 01-19-2011, 07:11 AM   #13
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1 is good.

I agree with Jammer. Use 1 battery; and unless you do a lot of dry camping and need the extra capacity, stick with one battery.
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Old 01-19-2011, 07:32 AM   #14
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Since I do very little dry camping I went from 3 group 24's to 1 group 27 from Cosco and it works for me.
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