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Old 04-25-2009, 04:41 PM   #1
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Why isn't engine battery a Deep Cycle type?

This may be kind of a dumb question, but I have been wondering why I could not use a Deep Cycle battery for the engine battery. I just replaced my House batteries because I had one DS battery that had a bad cell the other DS battery is perfect.
Is there a problem installing that DS for the engine battery. It seems it would last longer during long sitting times. I have a "Batteryminder" in use during storage times.

I have not done the change yet without some responses.

Thanks
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Old 04-25-2009, 04:44 PM   #2
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To oversimplify:

Deep cycle batteries are designed to provide a little current for a long time.

Starting batteries are designed to provide tremendous amounts of current for a very brief time.

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Old 04-25-2009, 06:16 PM   #3
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Rusty thanks for the response. I still wonder why the engine battery on the RV is any different in usage than that of a Inboard/outboard Boat. I have had a few of these and they all came with Marine DS batteries. The battery I took out of the RV was a Marine/RV Deep Cycle.
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Old 04-25-2009, 07:16 PM   #4
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As another poster said. Deep cycle batteries are designed to discharge over 20 or more hours. a nice slow, steady flow of current. To do this they have thick, solid plates.

Starting batteries are designed to be "Flash in the pan" they can deliver almost as much power. but they normally do it in less than a minute. perhaps 3 minutes total cranking time and .. That's all she wrote.

So if you have a 100 AH battery (That would be what a Group 27) A deep cycle could deliver 5 amps for 20 hours

A starting battery 500 amps for 20 seconds (or less)

In reality, both you should go half-zies on the power drain

Starters, as I recall, are usualy in the 100 - 250 amp range

(But that said.. I"ve not measured one recently)
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Old 04-25-2009, 09:52 PM   #5
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Starting a large block V-8 requires a lot of amps for a short period of time. My diesel truck has two batteries in parallel to start the high compression diesel.

Starting a marine OB does not require the power that is required for a big V-8. Ones that are used fro trolling motors are deep cycle to provide a lower current over a longer period of time.

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Old 04-25-2009, 10:17 PM   #6
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Ken, Thanks for the Information.
I am still confused as to why a Marine/RV Deep Cycle battery with a rating of 405 CCA and 505 MCA is not suffucient to start the 8.1 on occasion.

The boat I had had a large V8 (not an 8.1 by no means) and the Marine/RV Deep Cycle battery handled it just fine for years.

I probably will not change it out now after hearing from everyone. I just hate having to waste a good Deep Cycle Battery.
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Old 04-25-2009, 10:29 PM   #7
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My truck (see signature) uses 2 each group 27 batteries connected in parallel. Each battery is rated 750 cca.

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Old 04-26-2009, 12:08 AM   #8
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For a battery that is like a combination of a starting and deep cycle, use a GEL Cell battery... Super starting power, withstands deeper draining, plus fast recovery. Not cheap but worth it..
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Old 04-26-2009, 01:42 AM   #9
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Quote:
Originally Posted by Dunnpe View Post
Ken, Thanks for the Information.
I am still confused as to why a Marine/RV Deep Cycle battery with a rating of 405 CCA and 505 MCA is not suffucient to start the 8.1 on occasion.

The boat I had had a large V8 (not an 8.1 by no means) and the Marine/RV Deep Cycle battery handled it just fine for years.

I probably will not change it out now after hearing from everyone. I just hate having to waste a good Deep Cycle Battery.
MARINE DS batteries are not actually full deep cycle batteries. they are a combination type of battery. your 8.1 will probably start just fine on your good marine battery. if you have problems you can use the boost switch which parallels your house batteries and your starting battery to get the engine started. if you do not have the boost switch, get a good set of jumper cables.
i would definitely use the battery you have.
when you do replace the starting battery, look for a good AGM (absorbed glass mat) battery. lifeline, sears, optima and other manufacturers make good ones. they are less problematic than gel cells and cost less and will last just as long.
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Old 04-26-2009, 07:28 AM   #10
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Quote:
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Ken, Thanks for the Information.
I am still confused as to why a Marine/RV Deep Cycle battery with a rating of 405 CCA and 505 MCA is not suffucient to start the 8.1 on occasion.
A deep cycle battery can be used to start an 8.1 on occasion. Most motorhomes have an emergency start switch for use in case the starting battery goes dead. This switch connects the deep cycle house battery(ies) to the starting circuit and uses the house battery(ies) to start the engine.

A problem may arise if the temperature is very cold (the heavy plates in a deep cycle battery will not be able to produce enough power fast enough in cold weather) or if the house battery isn't fully charged, but most of the time it will work.

Also, as has been stated, a marine battery is more of a combination battery, so it will have an even better chance of cranking an 8.1 than a battery that is strictly designed as deep cycle.
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Old 04-26-2009, 09:19 AM   #11
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Any question you would like the answer to is NOT a dumb question. As has been said above, a Marine/RV DS is a compromise battery. They are not the best choice for either job. A true deep cycle may not even crank the engine over especially when engine is cold and weather is cold.
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Old 04-26-2009, 09:41 AM   #12
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Why can't you find a place for it and wire it in paralle and use house 3 batteries?
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Old 04-26-2009, 09:56 AM   #13
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I think the answer to that is that one weeker battery will drag down all the others. Someone have a better explanation?
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Old 04-26-2009, 10:05 AM   #14
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A non-matching battery in parallel will let the weaker on drag down the stronger battery. The stronger battery actually will try to charge the weaker one and results in a loss of total power. If you want to parallel non-matching batteries, you should have them separated by a isolator switch to prevent this drain on the stronger battery.

The marine battery is not a true deep cycle battery and is a compromise. It can be used to start a larger engine with a high amp draw, but will not last as well in that application as a battery designed for higher amp draws on a frequent basis. Typically a boat engine is not started as often as a typical car or truck.

Ken
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