Need new battery - currently inside - Fiberglass RV


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Old 03-03-2016, 08:17 PM   #1
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Need new battery - currently inside

1978 Trillium 1300, previous owner moved the battery inside under the front bunk. I think it was moved inside because a second propane tank was added on the tongue. It is an Interstate SRM-24. Because of my current location and schedule, I haven't utilized it in 2 years and wasn't smart enough to put a maintainer on it (even though I own one) and it is deeply sulfated.

If I am going to purchase a new battery, and intend to keep it inside, what are my options?
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Old 03-03-2016, 08:34 PM   #2
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If you want to keep it inside, I believe your best to go with an AGM battery, but I'm not an expert.
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Old 03-03-2016, 09:04 PM   #3
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Either go with the AGM battery or make sure that your new acid bath battery is placed in a sealed battery box that is then vented to the outdoors.
Dave & Paula
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Old 03-04-2016, 12:53 AM   #4
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Is there a particular AGM battery that anyone has had luck with?
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Old 03-04-2016, 04:37 AM   #5
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An AGM is the only lead acid battery that UPS will deliver so you can buy on line. They aren't cheap. My group 24 Lifeline was about $250. Napa and Sears used to carry Optima but I'm not sure they carry the blue one which is the Marine battery. Unless you plan on keeping the trailer for a very long time a Walmart $80 special is a less expensive option. In either case I'd move the battery to the tongue. It's a safer location in my opinion. Raz
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Old 03-04-2016, 06:49 AM   #6
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I'd be nervous keeping an expensive AGM battery on the tongue, where it is vulnerable to theft.

I'd also hate to make a hole in the shell for a vent for a conventional battery.

So, AGM inside or conventional outside for me.

As to which... for me it would depend on how much I used the trailer. The more use the more the expense of an AGM battery makes sense.

I remove our conventional battery between trips, since there is no power where I park the trailer. I keep it inside a storage room on a maintainer. Six years old and still going.
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Old 03-04-2016, 07:11 AM   #7
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Originally Posted by Jon in AZ View Post
I'd be nervous keeping an expensive AGM battery on the tongue, where it is vulnerable to theft.

I'd also hate to make a hole in the shell for a vent for a conventional battery.

So, AGM inside or conventional outside for me.

As to which... for me it would depend on how much I used the trailer. The more use the more the expense of an AGM battery makes sense.

I remove our conventional battery between trips, since there is no power where I park the trailer. I keep it inside a storage room on a maintainer. Six years old and still going.
The early Parkliner had 2 Optima blue batteries inside the trailer. There was a problem with overheating. There is a thread here with pictures of acid covered batteries. Parkliner moved the batteries to the tongue after that. My thought is they experienced thermal runaway, brought on by the equalizing cycle of the converter. Since the electrolyte in an AGM is a gel, equilizing is not necessary. AGM's are the safest lead acid you can buy which was my reason for buying one. And on the tongue is the safest place. As far as theft, I've yet to have anything stolen while camping. Raz
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Old 03-04-2016, 07:24 AM   #8
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Interesting, Raz. I hadn't heard those reports. I guess there won't be an AGM battery in my future. I have experienced theft while camping, but theft in storage is my bigger concern.
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Old 03-04-2016, 10:59 AM   #9
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Has anyone here at the fiberglassrv tried lithium batteries as a replacement for lead acid?
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Old 03-04-2016, 11:31 AM   #10
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I currently have a topic about batteries. I need a new one. My AGM research indicates that AGM is the way to go. Since your battery was moved inside AGM is a must for your situation as they are vent free and can be stored inside.
Check AMAZON as they offer the lowest price ($229-$250) delivered for a 100AH Exide brand group 31 size 12volt deep cycle.
With the battery inside DO NOT use a standard venting lead acid battery.
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Old 03-04-2016, 01:10 PM   #11
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I have a lead acid battery with vent tube installed and plumbed overboard and also in a plastic battery box.
It is a group 29 from Costco and the vents were modified for the venting and moulded in place with ABS plastic.
If you install the AGM like goes in my VW TDI you would still have to hook up vent tubes.


Sent from my SCH-I605 using Fiberglass RV mobile app
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Old 03-04-2016, 02:43 PM   #12
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Just did more AGM battery research...BEST BUY SO FAR....Amazon: Universal power group 45879 sealed Lead Acid AGM 100AH group 27 size deep cycle battery...excellent reviews from many....$149.99 + $10 shipping.
One RV owner reports 5 years of service and still going strong.

Redbarron55, My current battery location although inside is in a vented compartment. AGM Batteries do not require venting....spill proof and factory sealed...no maintenance required.
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Old 03-04-2016, 05:28 PM   #13
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Originally Posted by redbarron55 View Post
I have a lead acid battery with vent tube installed and plumbed overboard and also in a plastic battery box.
It is a group 29 from Costco and the vents were modified for the venting and moulded in place with ABS plastic.
If you install the AGM like goes in my VW TDI you would still have to hook up vent tubes.


Sent from my SCH-I605 using Fiberglass RV mobile app
As an owner of a tdi and as someone that just helped installed an AGM in a neighbor's tdi, why does that particular AGM need vent tubes?
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Old 03-04-2016, 05:38 PM   #14
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Originally Posted by Uplander View Post
Just did more AGM battery research...BEST BUY SO FAR....Amazon: Universal power group 45879 sealed Lead Acid AGM 100AH group 27 size deep cycle battery...excellent reviews from many....$149.99 + $10 shipping.
One RV owner reports 5 years of service and still going strong.

Redbarron55, My current battery location although inside is in a vented compartment. AGM Batteries do not require venting....spill proof and factory sealed...no maintenance required.
Thank you for your research and I am sure it will help others. I live in Alaska, and Amazon won't ship batteries here. Napa/Carquest are my only local options, with Costco and a few other chains possibly available on my way "out of here."*


*I will be leaving my isolated area of AK, driving through Canada, and then continuing on to the east coast of the US. Ideally, I would have a battery before I left.
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