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New Battery


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Over the winter my battery decided it has had enough... So I need a new one. Problem is I don't have a clue about them :blush: I have bought batteries for cars, but for them I just look in the book. I doubt my bu is in the book :whistle:

So what do I need to know? My old one says Marine on it, is that important?

ps, no big stereo to worry about :(

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Over the winter my battery decided it has had enough... So I need a new one. Problem is I don't have a clue about them :blush: I have bought batteries for cars, but for them I just look in the book. I doubt my bu is in the book :whistle:

So what do I need to know? My old one says Marine on it, is that important?

ps, no big stereo to worry about :(

Costco....three year free repalcement, price is great...measure the size and head to Costco. New battery is about $80-85.

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I would not use a deep cycle for your primary starting battery. Those are for trolling motors, etc. A typical car battery with plenty off CCA works just fine. The marine starting batteries realy aren't any different, but most are only guaranteed for a year while a car battery is for 3-6 depending on what you get. I just bought an Interstate battery for my Echelon this spring. A little more expensive but all my friends that have boats have had good luck with them. Or you can get an Exide battery at Mendards for about $60 and there is a $10 rebate thru Exides website.

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Deep cycle marine batteries are standard equipment in boats, even for starting it's not an issue. Most of the marine batteries are for Deep cycle/cranking, especially the ones at Costco I was talking about. Heck I start my boat with 6v golf cart batteries, those are REAL deep cycle batteries. NO issue there either.

Edited by Bobby Light
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Interstate batteries work great.

More info on type of batteries,

Starting, Marine, and 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 an 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 the 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.

Using a deep cycle battery as a starting battery

There is generally no problem with this, providing that allowance is made for the lower cranking ampscompared 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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I just ran with a pair of Diehards when I was in the same situation a few years ago. Costco was in the middle of changing their brands from Optima to whatever they have now. And I figured no matter where I'm at, there is most likely to be a Sears nearby to handle any warranty issues.

I installed 2 batteries, a deep cycle for the stereo & a regular marine battery for the starter. And more importantly I installed an on board charger to help the new batteries get thru the winters around here. The Guest Dual Bank charger was about $100, which is more than you'll need with a single battery charger. It's been about 3 yrs now, we'll see how long these batteries last.

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