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Old 11-09-2019, 07:18 PM   #1
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AGM 6-Volt Battery Recommendation

Need to replace the two Interstate batteries that were new in our 2018 27' FC.

They are at 20 months. Out of warranty.

Which brand do fellow Airstreamers recommend?

I have a bowl of popcorn… awaiting responses!
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Old 11-09-2019, 07:39 PM   #2
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LifeLine GPL-4CT. Mil spec quality
https://lifelinebatteries.com/produc...eries/gpl-4ct/

I just installed 4 of them. They are AWESOME!
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Old 11-09-2019, 07:57 PM   #3
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You absolutely need to make sure you have a 3 or 4 stage charger or you will cook the new batteries.
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Old 11-09-2019, 08:32 PM   #4
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We spent a lot of money on a set of Lithium batteries, the upgraded wiring, a new set of breakers, a lithium capable converter and a battery monitor. In use, the bank never dropped below 90% until we got home and used battery power to support refrigerator testing and lights over a 7 day period. The bank got down to 80%. Time to take the coach back to storage. Hook up to 120V 20amp house outlet. Four hours later, bank was at 100%. With the lead acid Interstates, we needed to charge for one to two days to get the bank to 12.7+ volts. Overnight we dropped to 12.3 or 12.4 volts.

Now not all is perfect when you throw money ate a problem, and one of the major improvements we made with lithium was weight reduction, but so far, the investment seems to have really improved our AS travel life.

If weight savings is not an issue, 6 volt cart batteries help expand your bank capacity and can be purchased for $100-200 each. AGMs reduce your maintenance and can be purchased for $200-400. In any case, a $200-300 battery monitor gives you bank status visibility and greatly improves your ability to manage your electrical usage.

Note - after the first year, we replaced the OEM Interstates with like batteries. They did the job. They sit in our garage now and are still viable.

So, it's not just a mater of what battery type and brand. It's a mater of what your objectives are. On our last trip, we left the generator at home and did quite well without it. For us, it was money well spent.

Know thyself and make the best choice for your travel style. Pat
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Old 11-10-2019, 07:44 AM   #5
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I have Fullriver. Have had them a year and they are performing well.
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Old 11-10-2019, 08:57 AM   #6
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What Batts?

Another “Fullriver” AGM user here. Heavy but will fit the pre-2017 larger battery boxes with a cut away mod. Main reason why we gave them a try.

YouTube of our process
https://youtu.be/0lORzPOlaoM

Two DC220-6 in series with are 220AH 6volt and like others suggested a “must do upgrade” to a multi-stage converter /charger Progressive Dynamics
PD4655VL with lithium charging capability.
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Old 11-10-2019, 09:51 AM   #7
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IMHO, go with lithium
- 60% weight reduction for the same AH
- lower TCO over 5-6 year, CAPEX is higher , but TCO & OPEX is much lower
- investment improves AS resale
- can go down to 10% capacity vs 50 with Lead acid
- goes not have reduced lifetime after heavy usage
- can be stored inside as it does not off gas like lead acid
- reduces tongue weight when brought inside

plus may other reasons.

many have heard from AS that they will start using LION in 2021 for new trailers
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Old 11-10-2019, 10:17 AM   #8
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One of the challenges you may run into is your battery box will require a bit of a increase in hight to accommodate 6 volt batteries. There is a detailed thread/blog on the forum about this.

Personally we use 2- 6volt Trojan T-105 @ 250Ah. We maintain the system with a Flo-rite and 200 amp Solar on the roof + 160 amp solar suitcase when boondocking. If we want to microwave something we can attach our 3400w Champion Very Happy with this and it do not break the bank
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Old 11-10-2019, 11:15 AM   #9
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Hi

AGM’s are pretty expensive. I would at least consider lithium’s....

Bob
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Old 11-10-2019, 11:20 AM   #10
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You did not give any info on you use / needs ?
And no reasoning behind using AGM ?

AGM's cost more with generally less performance .
They run [ if treated correctly ] a little higher voltage - about 1 volt .
And much less gassing to deal with .
And then cost 2+ times more than FLD - Flooded Lead Acid , the gassing issue can be almost eliminated with special cell caps , also much less watering .

As touched on already , what your circumstances are for choosing , I would recommend Trojan and have been watching the FullRiver [ but never AGM's ] .
Then if you can afford to spend more upfront , go Lithium .

Either way , almost anyone needs to learn much more !!! to get the most of any battery SYSTEM - battery / charging .

If you do not take the time to learn - then you keep spending too much money on too frequent battery replacement ;(
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Old 11-10-2019, 11:37 AM   #11
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I replaced my two 4 year old 12 volt batteries with two golf cart 6 volt batteries and am super happy after a long summer trip on the Newfoundland caravan.
Only (small) problem is the 6 volt batteries are an inch or so taller than the originals and I had to build up the sides of the box with some oak pieces - simple job.
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Old 11-10-2019, 11:46 AM   #12
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Golf cart batteries

In boating, a number of us have changed to 6V golf cart batteries that have proved to be outstanding.
One concern of lithium is that they have not yet completely solved the fire risk. If installed, they should be easily visible. That is why airlines don't allow larger lithium batteries to be checked but must be carried on board where a fire can be quickly discovered
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Old 11-10-2019, 12:15 PM   #13
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Our Trojan 6 volt AMG batteries have failed after two years. So we are going with lithium with the hope of have something that will last longer and give more AH.
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Old 11-10-2019, 12:47 PM   #14
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Quote:
Originally Posted by Keithkleinmd View Post
In boating, a number of us have changed to 6V golf cart batteries that have proved to be outstanding.
One concern of lithium is that they have not yet completely solved the fire risk. If installed, they should be easily visible. That is why airlines don't allow larger lithium batteries to be checked but must be carried on board where a fire can be quickly discovered
Wow! According to all of the literature I have seen LiFePO4 batteries do not present a fire hazard, ever. There is no fire risk. You are confusing it with a different Lithium chemistry.
Larry
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Old 11-10-2019, 02:37 PM   #15
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Go lithiums if there is any way. You will be surprised how much more fun camping will be, whether at Wally World or the National Grasslands.
I rarely use hook ups even at the Mothership Terraport
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Old 11-10-2019, 02:54 PM   #16
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Lifeline AGMs in our Airstreams since 2005
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Old 11-10-2019, 06:55 PM   #17
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AGM 6 Volt

I have a 2018 FC 25 and installed the Lifeline GPL-4CT 6 Volt AGMs; they fit easily into the battery box and have been superb! First time in a long time I haven't had to hassle with trailer batteries!

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Old 11-10-2019, 08:01 PM   #18
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Quote:
Originally Posted by Vantair View Post
Another “Fullriver” AGM user here. Heavy but will fit the pre-2017 larger battery boxes with a cut away mod. Main reason why we gave them a try.



YouTube of our process

https://youtu.be/0lORzPOlaoM



Two DC220-6 in series with are 220AH 6volt and like others suggested a “must do upgrade” to a multi-stage converter /charger Progressive Dynamics

PD4655VL with lithium charging capability.


Just to add, these batteries fit perfectly in the battery box of our 2017 27’FC.
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Old 11-10-2019, 08:17 PM   #19
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Originally Posted by GMFL View Post
LifeLine GPL-4CT. Mil spec quality
https://lifelinebatteries.com/produc...eries/gpl-4ct/I just installed 4 of them. They are AWESOME!
Completely agree. We have 4.

73/gus
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Old 11-10-2019, 10:03 PM   #20
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You can buy extenders to make the box taller
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