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Old 01-07-2016, 06:32 PM   #1
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Best Battery

I went to my local auto parts store today for a replacement battery for my Montana. Requested a deep cycle battery and was steered to a Marine battery which they said was a deep cycle. Battery clearly stated starting battery, not deep cycle. Are all marine batteries deep cycle and is a deep cycle the best battery for an RV? Is there any problem using an AGM battery? I had heard they cannot be charged by a standard battery charging unit and I wonder if that includes the recharger in a camper.

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Old 01-07-2016, 06:43 PM   #2
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That's what you will get at a chain auto parts store.

It will take a little homework to get a real deep cycle 12 volt battery. That's why many use 2, 6 volt batteries in series.

Check Interstate, Exide or Trojan.

You can use a AGM with most chargers, but for the most life, a good 3 stage charger with an AGM setting is needed.
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Old 01-07-2016, 07:00 PM   #3
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Maybe this might help to explain the difference in "Marine" batteries

Marine Batteries | RV Battery
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Old 01-08-2016, 09:46 AM   #4
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Just go to the Trojan website and work your way around--they have just about any type battery you could want to put in an RV.
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Old 01-08-2016, 12:30 PM   #5
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If you're not going to dry camp for any extended length of time I think just about any Marine/RV Deep Cycle battery will work acceptably with today's technology. If you want to extend your dry camping time then more research and true deep cycle is probably the best bet. We had an Optima Blue Top that lasted 8 years in our rig. I liked that it is a dry battery, so no water maintenance was required. Left it hooked up constantly and never had a problem with charging via the RV charger. It used to support us for 3 nights of dry camping, but we have pretty frugal habits... YMMV. It worked well for us... Best of luck with whatever you decide.
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Old 01-09-2016, 10:04 PM   #6
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Thanks to all for the great advice. I found a marine full deep cycle battery. Should work just fine as I never dry camp and should handle the power requirements for a day if the campground power goes out. Any longer than that and I will use the genny. Its not an installed unit so I want to be careful of noise issues and not use it unless absolutely necessary.

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Old 01-09-2016, 10:10 PM   #7
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If not dry camping, Walmart has a 12vdc Marne battery. Installed two in my sons motorhome a few years ago. Has done a good job. Good price, good warranty, readily warranted and available most everywhere.
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Old 02-03-2016, 08:19 PM   #8
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Quote:
Originally Posted by Neverhome View Post
I went to my local auto parts store today for a replacement battery for my Montana. Requested a deep cycle battery and was steered to a Marine battery which they said was a deep cycle. Battery clearly stated starting battery, not deep cycle. Are all marine batteries deep cycle and is a deep cycle the best battery for an RV? Is there any problem using an AGM battery? I had heard they cannot be charged by a standard battery charging unit and I wonder if that includes the recharger in a camper.

Thanks.

Neverhome
The subject of batteries is truly wide and deep. There is no one, simple or easy answer that can be applied to all situations.

Generally, for the coach section of a motorhome a deep cycle battery such as a lead-acid marine battery is a better choice than a starting battery and if you wish to avoid getting involved in researching and developing an in-depth understanding of batteries and charging them, a deep cycle marine battery will probably suffice just fine in most cases. Starting batteries are meant to deliver large amounts of current for short periods of time whereas deep cycle batteries are meant to deliver lower amounts of power over longer periods of time and are therefore more appropriate for use in the coach section of an RV.

There are several types of battery technologies including lead-acid, AGM, and lithium. Each has its own characteristics as well as its advantages and disadvantages.

For a rig that gets only occasional light use it may be the case that almost any battery will do even a starting battery. However, it is best to understand what demands you will place on a battery before deciding which kind to get. There is no one answer that is right for everybody. You should also be cognizant of the features of your rig's charging system to make sure it is compatible with a battery you select. It is almost certainly the case that virtually every rig's charging system is designed to charge lead acid batteries.

When shopping for a battery realize that a very large percentage of batteries sold under various brand names such as Sears Die Hard, Interstate, etc. are manufactured by the same company, Johnson Controls. This doesn't mean the batteries are identical because they may be made to different specifications for different brand names.

Selecting a battery with a greater reserve capacity or ampere hour rating will provide more electricity and be usable for longer periods before recharging becomes necessary. Note, however, that even here making a choice isn't so easy. You see, there are different methods by which the ampere hour ratings of a battery may be determined and comparing batteries rated using one method to batteries rated using another method may result in a misinformed purchasing decision. I've written about this on my blog. Here is an excerpt: "Manufacturers and resellers of batteries use different methods to determine and advertise the AH capacities of their batteries and this must be understood in order to make an informed choice when selecting batteries. Using one method versus another can lead a consumer to purchase Battery One over Battery Two thinking he/she is getting more storage capacity from Battery One when in fact it’s the other way around. As it turns out, if you drain a battery more slowly, for example at 1 amp per hour, you will get more AHs out of it than you will if you drain it at a higher rate such as 20 or 25 amps per hour. A battery rated at 100 AHs using the 1 amp per hour rate of drain as a measure will likely have closer to a 75 or 85 AH rating if drained at 20 amps per hour. Manufacturers that want to make their batteries look good use the 1 AH numbers in their literature whereas a more commonly used industry standard is the 20 AH rate of drain. When comparing battery AH storage capacities you must have information expressed at the same rate of draw. When you hear that a battery’s AH rating at C1 is 75 it means that its Capacity is 75 AH when it is drained at 1 amp per hour. If a battery has a 75 AH capacity at C20 it means its AH capacity is 75 if drained at 20 amps per hour. Make sure that when comparing batteries you get their AH ratings at the same rate of drain, the same C rating."

If you want to keep things really simple just buy a deep cycle battery of the right group to match your battery box ("group" specifies dimensions). If you're trying to decide between two virtually identical batteries pick the one that weighs more. It is probably better made.
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Old 02-03-2016, 08:59 PM   #9
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Quote:
Originally Posted by Neverhome View Post
I went to my local auto parts store today for a replacement battery for my Montana. Requested a deep cycle battery and was steered to a Marine battery which they said was a deep cycle. Battery clearly stated starting battery, not deep cycle. Are all marine batteries deep cycle and is a deep cycle the best battery for an RV? Is there any problem using an AGM battery? I had heard they cannot be charged by a standard battery charging unit and I wonder if that includes the recharger in a camper.
Batterys. A wide & wonderful topic.

Start with what type of RVer are you? If you are a FHU all the time type then go with the minimum cheap & nasty multi purpose marine deep cycle.

If you are the type who wants more than 1 night capability dry camping then you will need to do some reading to get some understanding of different types for different applications.

Websites for the better battery makers such as Trojan & Lifeline are good places to start.

Nice to see an interest in AGM. I am an AGM fan. Have a single 4D Lifeline AGM, headed into its 6th season with no issues. We are multi month travelers who prefer SPs but do not panic when faced with no utilities. Dry camping for 3 or 4 nights is a breeze. We like doing music festivals which often means dry camping.

The AGM battery is the base of as better than average system that includes a multi stage programable inverter/charger & having an inverter genny.
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