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Old 03-22-2015, 08:49 PM   #11
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According to the Exide website they have 3 types of marine batterys.

MS = Marine starting
MDP = Dual purpose
MDC = Deep cycle

MDC27 is a Group27 deep cycle battery.
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Old 03-22-2015, 10:01 PM   #12
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What interested me was that it is rated for 105 amp hours at 20 hrs which would be an upgrade from my group 24 battery which I think is 65 amp hours. Also Menards has 11% off through the 3/28.
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Old 03-22-2015, 11:40 PM   #13
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That is a marine deep cycle/starting battery hybrid.

You can get a true deep cycle 6v GC2 golf cart battery at Costco for $84. You will need two of them in series though.

My group 24 "deep cycle" that came with my toy hauler couldn't run the heater over night at 45 degrees Fahrenheit without taking the battery under 50%.

The group 27 you are looking at would only fair a little bit better.
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Old 03-23-2015, 12:04 AM   #14
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Originally Posted by Rrickim63 View Post
I thought the general rule was if it showed cranking amps it wasn't a deep cycle
Right on the money! This one is right "on the verge". It may qualify as a deep cycle, but with the mesh type plates it's crawling just under the wire.

20 bones more to get into a solid plate deep cycle would be well worth it.

It always amazes me when folk argue that $90 deep cycles are no different than the $150 cells. If you've "lived it".. you really realize that you get what you pay for.. but for most seasonal campers the $90 "jobs" are more than adequate. Ya gonna kill em in 3-5 anyway, right?
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Old 03-23-2015, 03:08 PM   #15
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Any battery with the capacity shown in CA or MCA may or may not be a true deep-cycle battery. It is sometimes hard to tell, as the term deep cycle is often overused - we have even seen the term "deep cycle" used in automotive starting battery advertising. CA and MCA ratings are at 32 degrees F, while CCA is at zero degree F. Unfortunately, the only positive way to tell with some batteries is to buy one and cut it open - not much of an option.
This is from your link, at $84 dollars I would use this battery as a deep cycle.But do what you want to do.
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Old 03-23-2015, 03:14 PM   #16
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This is not a pure deep cycle battery. The nautilus is a dual purpose battery. A true deep cycle battery is a single purpose deep cycle battery

EXIDE® Nautilus™ Marine Deep Cycle
Hey Grayfox if you reread your link how much more of a description of a deep cycle battery do you want?
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Old 03-23-2015, 05:23 PM   #17
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Archicamper

I know and also a lot of other people know what type of battery that is, so buy yourself a couple and you will be good to go with 210 amp hours ( 110 usable). My Exide battery bank is 6 years old and is as strong as it was when purchased. Go for it !
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Old 03-23-2015, 10:38 PM   #18
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Hey Grayfox if you reread your link how much more of a description of a deep cycle battery do you want?

First my apology for using the Nautilas a general example as it is offered in several different service types. Just my opinion but A true deep cycle battery could provide longer service life if properly maintained and cared for. Certainly my first choice for RV use... just my opinion.

The explanations below could provide further info. that may be helpful.

Starting, Marine, or Deep-Cycle Batteries
Starting
(sometimes called SLI, for starting, lighting, ignition) batteries are commonly used to start and run engines. Engine starters need a very large starting current for a very short time. Starting batteries have a large number of thin plates for maximum surface area. The plates are composed of a Lead "sponge", similar in appearance to a very fine foam sponge. This gives a very large surface area, but if deep cycled, this sponge will quickly be consumed and fall to the bottom of the cells. Automotive batteries will generally fail after 30-150 deep cycles if deep cycled, while they may last for thousands of cycles in normal starting use (2-5% discharge).

Deep cycle
batteries are designed to be discharged down as much as 80% time after time, and have much thicker plates. The major difference between a true deep cycle battery and others is that the plates are SOLID Lead plates - not sponge. This gives less surface area, thus less "instant" power like starting batteries need. Although these can be cycled down to 20% charge, the best lifespan vs cost method is to keep the average cycle at about 50% discharge. Unfortunately, it is often impossible to tell what you are really buying in some of the discount stores or places that specialize in automotive batteries. The golf car battery is quite popular for small systems and RV's. The problem is that "golf car" refers to a size of battery case (commonly called GC-2, or T-105), not the type or construction - so the quality and construction of a golf car battery can vary considerably - ranging from the cheap off brand with thin plates up to true deep cycle brands, such as Crown, Deka, Trojan, etc. In general, you get what you pay for.

Marine
batteries are usually a "hybrid", and fall between the starting and deep-cycle batteries, though a few (Rolls-Surrette and Concorde, for example) are true deep cycle. In the hybrid, the plates may be composed of Lead sponge, but it is coarser and heavier than that used in starting batteries. It is often hard to tell what you are getting in a "marine" battery, but most are a hybrid. Starting batteries are usually rated at "CCA", or cold cranking amps, or "MCA", Marine cranking amps - the same as "CA". Any battery with the capacity shown in CA or MCA may or may not be a true deep-cycle battery. It is sometimes hard to tell, as the term deep cycle is often overused - we have even seen the term "deep cycle" used in automotive starting battery advertising. CA and MCA ratings are at 32 degrees F, while CCA is at zero degree F. Unfortunately, the only positive way to tell with some batteries is to buy one and cut it open - not much of an option.

Deep Cycle Battery as a Starting Battery
There is generally no problem with this, providing that allowance is made for the lower cranking amps compared to a similar size starting battery. As a general rule, if you are going to use a true deep cycle battery (such as the Concorde SunXtender) also as a starting battery, it should be oversized about 20% compared to the existing or recommended starting battery group size to get the same cranking amps. That is about the same as replacing a group 24 with a group 31. With modern engines with fuel injection and electronic ignition, it generally takes much less battery power to crank and start them, so raw cranking amps is less important than it used to be. On the other hand, many cars, boats, and RV's are more heavily loaded with power sucking "appliances", such as megawatt stereo systems etc. that are more suited for deep cycle batteries. We have used the Concorde SunXtender AGM batteries in some of our vehicles with no problems.
It will not hurt a deep cycle battery to be used as a starting battery, but for the same size battery they cannot supply as much cranking amps as a regular starting battery and is usually much more expensive.
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Old 03-23-2015, 11:18 PM   #19
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I saw this today at Menards for $84. Looks like a good deal but I'm not a battery expert.Attachment 71964


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I have been using this deep cycle battery for years. It is s great buy for the price. Buy it when they have one of their sales and it is even cheaper
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Old 06-18-2015, 03:41 PM   #20
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I bought one (exide 27MDCST) at camping world ( Menards was out), I'm going to used it to run my CPAP because the jumper pack I was using won't last 12 hours. I use solar on the trailer when parked with two T-105's and going to take this home and charge it during the week and use it on weekends and on the trailer travelling, hopefully it will work well
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