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Old 11-16-2018, 08:46 PM   #1
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New 6V Batteries

My 07 Monaco Diplomat needs new house batteries. I have been running Trojan T-105 RE's. They have been good batteries, but constantly need water.
I guess I will look at T-105's. Does anyone suggest anything different?
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Old 11-16-2018, 09:23 PM   #2
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You might consider an AGM (absorbed glass mat) style battery. They don't require water refills. I found these 6 volt agm's at a decent price, but know nothing about them as a brand. https://www.apexbattery.com/upg-ubgc...&isp_ref_pos=2
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Old 11-16-2018, 09:32 PM   #3
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You might need to look at a converter that has a better 3 or 4 stage charging profile. The newer ones don't boil the batteries so they do not need water as frequently and last longer.

Progressive Dynamics makes a very good replacement for the standard charger for not too much $$$. Look at Costco for Interstate GC2 batteries, about $90 each for 6 volts.
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Old 11-16-2018, 09:45 PM   #4
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Trojans are good batteries, no doubt. But, I think you are somewhat paying for the name. I've had very good results with Deka batteries, made by East Penn manufacturing in Pennsylvania. I've literally installed hundreds of their batteries in off grid and back-up power systems in homes, RV, and cabins over the last 16 years.
I agree you should check out the charging profile of your converter. If it holds a constant float voltage higher than about 13.2 volts it is probably partly responsible for your water loss. It may be that an upgrade is in order to a unit with a 3 stage charging profile, particularly one that is programmable. Trojan batteries in particular usually call for a slightly higher bulk and absorb charge voltage than some other brands.
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Old 11-17-2018, 05:07 AM   #5
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Quote:
Originally Posted by keymastr View Post
You might need to look at a converter that has a better 3 or 4 stage charging profile. The newer ones don't boil the batteries so they do not need water as frequently and last longer.

Progressive Dynamics makes a very good replacement for the standard charger for not too much $$$. Look at Costco for Interstate GC2 batteries, about $90 each for 6 volts.


Pretty much what I have except the batteries are Sam's Club Duracell GC2. The batteries only need water twice a year.
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Old 11-17-2018, 06:52 AM   #6
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I replaced my Interstate 6v batteries this past spring with Trojan T105ís. I find they need less water, but then again the Interstates were seven years old. I also updated my converter with a four stage controller a couple of years ago and once the batteries are coated the float level is proper and meets the correct voltage requirements whereas prior to the controller the voltage was higher.
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Old 11-17-2018, 08:02 AM   #7
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I too support Deka batteries. And the Duracell at Sam's are made by Deka, and as far as I can tell by the spec sheet, are identical.
I have used at least ten in boats, cars, RVs, etc and I have been happy every time. I upgraded my Interstates to Deka AGM last year this time, and am happy. I had a watering system before and AGMs are even easier!
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Old 11-17-2018, 09:36 AM   #8
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THREE THINGS..... I replaced my standard size 6v with Trojan L16h., Se "doubled house battery capacity 04 Diplomat" on this forum. Second, the single point watering system mentioned in that post is awesome. third, when I reset my Heart Freedom charger for the new capacity, I discovered that the unit had been set on AGM which charges to a higher voltage/rate thus boiling water and causing frequent fills. Happy Trails TB
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Old 11-17-2018, 10:09 AM   #9
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Three years ago I replaced my six wet cell batteries with 300 amp Lifelines. I now have 900 amps of storage for dry camping and no more water to check/add and the terminals are always clean and dry. They're not cheap, but well worth it IMHO.
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Old 11-17-2018, 01:01 PM   #10
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I just changed my Decka out with Trogan T-105 Gel Batteries. So far working much better and don't have to worry about the cold weather. About 250 each so a bit more but no more corrosion issues. Charger was set right for the old batteries but still had to add water at least every 90 days. Changed the setting to the Gel specs and will find out down the road. I needed more capacity for Boondocking when needing heat overnight and quiet times for the generator.
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Old 11-17-2018, 07:05 PM   #11
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If your batteries constantly need water added, they are either being overcharged or overheated, both of which cause loss of water. Changing battery brands or models won't help, since they all share the exact same chemistry (the standard lead acid battery cell).

A 2007 Diplomat should have a good quality 3-stage inverter/converter/charger, but sometimes a poor wire connection at the batteries or a bad cell in one of the batteries can trick the charger into overactivity.
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Old 11-17-2018, 09:03 PM   #12
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Trojans are good batteries, no doubt. But, I think you are somewhat paying for the name. I've had very good results with Deka batteries, made by East Penn manufacturing in Pennsylvania. I've literally installed hundreds of their batteries in off grid and back-up power systems in homes, RV, and cabins over the last 16 years.
I agree you should check out the charging profile of your converter. If it holds a constant float voltage higher than about 13.2 volts it is probably partly responsible for your water loss. It may be that an upgrade is in order to a unit with a 3 stage charging profile, particularly one that is programmable. Trojan batteries in particular usually call for a slightly higher bulk and absorb charge voltage than some other brands.

I agree that Deka batteries a very good batteries and cost a lot less then Trojans or Interstate. The Deka I have on my coach right now have lasted six years and seem to be going strong. You do have to check the distill water level around every two months. When new they do not use much, as they age they will use a bit more. They sell for around $110. bucks.
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Old 11-19-2018, 04:50 PM   #13
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Just got the MH started up, first time with the Trojans gel installed and first time I didn't have low voltage when sitting for a month or so

Certainly not having corrosion issues is a plus, no water addition and holding voltage has made the $1000 investment worth it so far

We will see in a few years
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Old 11-19-2018, 09:32 PM   #14
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Dad always told me, "buy your batteries by weight, the heavier the better". He was talking lead acid and always found a way to make a 27 series fit in a 24 space. Check the weight on the Trojans vs. the Dekas..
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