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Deep Cycle Marine Batteries

Old 07-08-2014, 07:15 AM
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Default Deep Cycle Marine Batteries

Batteries can be confusing, to say the least. I'm pulling my hair out trying to figure out what to use for my trolling motor. Here's the scoop. Carolina Skiff 18JVCC with 60hp Yammy and just installed MinKota Rip Tide 55ST trolling motor. I fish in both fresh and salt water, mostly in salt water where there is more wind and tide resistance. I've been researching batteries for a week now and don't seem to be getting any closer. I don't really care about cold cranking amps because these batteries are solely for the trolling motor. I do care about the Reserve Capacity. When I see 200 minutes of reserve capacity and don't see at what amperage, I assume it's 1 amp. Is that correct? Or is the standard 20 amps? I note that the higher the RC, the higher the price. Optima blue, for instance, is more that I want to pay. Also. I'm considering going with dual batteries because, connected in parallel, they will provide twice the RC at 12v. I'm looking for opinions and suggestions from those who have experience with this. Should I go with two medium priced or 1 high priced? The boat doesn't weigh much but has a higher profile than a bass boat which means more wind resistance.


Has anyone had any experience with Duralast batteries sold by AutoZone? Also, the batteries will be located where servicing will be somewhat difficult, so I'm considering maintenance free/AGM.

Last edited by The Lost Navigator; 07-11-2014 at 05:07 AM. Reason: additional information
Old 07-08-2014, 10:52 AM
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There are a lot of good resources out there on batteries. The RC I believe is based off of 25 amps and is how long that battery will maintain a voltage over 10.something volts. But battery drain at higher amperage's is not linear. That 200 minute battery might only be a 75 minute battery at 50 amps. if you go to the battery manufactures website they will sometimes list more details on the battery's capacities.

Usually with the more expensive batteries, what you are getting is not necessarily any more reserve capacity, but AGM, maintenance free, more tolerant of vibrations, mounting flexibility, and in some cases longer service life (although a properly maintained flooded battery will often last just as long).

If the batteries are going to be mounted in a location that is easy to service(add water when needed), and not going to get banged around too much, then I would go with a regular flooded battery. Start with one and see if it provides the run time you need, if not add the second one later.

Check out the Interstate Deep Cycle and AC Delco Voyager marine batteries. For a little more money I have heard good things about the Trojan batteries, but for around $100 the interstates and ac delcos when properly maintained and cared for are pretty hard to beat.
Old 07-08-2014, 11:00 AM
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Sears Platinum AGM and call it a day. GREAT batteries. I'll be adding a 36V MK TIM and going with these or Interstate. Watch for sales on the Sears and they can be had for just under $250.
Old 07-08-2014, 11:31 AM
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Is it your plan to have one battery for starting the motor and then other battery(s) for the trolling motor?
Old 07-08-2014, 12:06 PM
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Like grandmaster said, a good flooded battery that is taken care of will give long service and not break the bank. Interstate Pro ECL deep cycle's have very good reserve capacity at a reasonable price. I'm sure there are other brands that will perform as well or better at similar cost. With a 60 hp motor, your starting load can easily be handled by a good deep cycle (no need for a dedicated "starting" battery with tons of CCA's). If you're going to use the trolling motor a lot, install 2 deep cycles and alternate them. You won't have to battery shop for a long time.
Old 07-08-2014, 12:25 PM
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Buy a pair of 6v batteries and connect them in series. This will give you 12v and the highest possible RC and AH.
Old 07-08-2014, 02:27 PM
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Make sure the batteries you are comparing use the same current draw and temp to determine RC. I've seen some mfger's use a lower 20A draw or a different temp. It should be 25A at 80 deg F.

I just replaced my Trojan's (~5 years old) with a set of Deka's. It was the second set of Trojan's that I've had and likely won't be getting them again. I never had a problem with them but I don't think the premium price really gave me any better performance than any other flooded battery. I now mainly compare RC/$ as a starting point.

And if you can swing it, definitely get two batteries. Any chance you can upgrade your trolling motor to a 24v model? It will be more efficient in the long run.
Old 07-11-2014, 04:43 AM
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My Motor starting battery is separate from my trolling motor battery.
Old 07-11-2014, 04:47 AM
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Originally Posted by stormsearch View Post
Make sure the batteries you are comparing use the same current draw and temp to determine RC. I've seen some mfger's use a lower 20A draw or a different temp. It should be 25A at 80 deg F.

I just replaced my Trojan's (~5 years old) with a set of Deka's. It was the second set of Trojan's that I've had and likely won't be getting them again. I never had a problem with them but I don't think the premium price really gave me any better performance than any other flooded battery. I now mainly compare RC/$ as a starting point.

And if you can swing it, definitely get two batteries. Any chance you can upgrade your trolling motor to a 24v model? It will be more efficient in the long run.
Thanks. I did think about a 24V system but after some research and $$ expectations, I decided on the 12V 55 pound riptide ST. Now that its mounted on the skiff, that's pretty much it.
Old 07-11-2014, 04:40 PM
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Originally Posted by I'm on a boat View Post
Buy a pair of 6v batteries and connect them in series. This will give you 12v and the highest possible RC and AH.
Or buy two 12v batteries and wire them in parallel to get double the AH at 12 volts. More power if one cell dies than with needing two 6 volt batteries to be at 100%.

A trolling motor may function at 10-11 volts but you do serious harm to the battery if you discharge it below 50% or 12.20 volts. OK once in a while to take it to 25% but you should not do this on a repeated basis if you want the longest life possible.

All that matters is the AH or amp hours the battery can provide. If you have 100 AH battery and take it to 50% DOD then you have 50 amp hours available for a trolling motor. If the motor draws 5 amps at half of full throttle then you have enough battery for 10 hours of trolling.

A battery that provides CCA figures is a hybrid that is designed for light duty discharge and starting (quick discharge) and not a true deep cycle battery. This is good for use with the engine but not for use to power a trolling motor.

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