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Choosing batteries for MinnKota 80lb thrust Trolling motor

Old 10-24-2019, 08:41 AM
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Default Choosing batteries for MinnKota 80lb thrust Trolling motor

I’m looking at batteries for a trolling motor, but I don’t want to spend 600 dollars on two optima batteries and I was looking at these AutoCraft Marine Battery, Group Size 27M, 675 CCA batteries. They have a Reserve of 180 minutes. Would that work for my trolling motor?
Old 10-24-2019, 08:52 AM
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Any two marine deep cycle batteries will be fine. I run two AC Delco 27's and can fish 2-3 days without charging. They were ~100 each
Old 10-24-2019, 09:42 AM
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I just had my 2 type 29 deep cycles (WalMart brand) die after 6 years. I let them run down and sulfate.
This is for a 24VDC Minn Kota trolling motor. My battery boxes can take a bit larger than a type 29 so I've been shopping around.
Batteries+ had Duracell deep cycles for $120.00 with decent ratings but I am cheaping out.
O'reilly Auto Parts has type 31 deep cycles for $96.00.
https://www.oreillyauto.com/detail/b/marine-5356/battery-accessories-16452/deep-cycle---marine-batteries-17354/220f7dcd7121/super-start-marine-group-size-31-top-post-battery/31dcmj/4742532
Supposedly they are manufactured by Deka. They also have type 27 at good price.
I have 2 of them now. No horse in the game. Just shopping around myself.

Type 27
https://www.oreillyauto.com/detail/b/marine-5356/battery-accessories-16452/battery---automotive-16864/battery---best-fit-16245/ec27e4e51018/super-start-marine-group-size-27m-top-post-battery/27dcmj/4742530

Old 10-24-2019, 12:02 PM
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Ditto cheap deep cycles. I don't know how big your boat is, but my 80lb on a 17' boat I use two group 24s.
Old 10-24-2019, 01:45 PM
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Originally Posted by acme54321 View Post
Ditto cheap deep cycles. I don't know how big your boat is, but my 80lb on a 17' boat I use two group 24s.
I have a 20ft Nautic Star Angler 211
Old 10-24-2019, 03:20 PM
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Sams Club Duracell AGMs. Best bang for the buck. The group 34 is a good battery or you could go to the 31. AGMs make great trolling motor batteries because you. An deep cycle them hundreds of times without loss of capacity.
Old 10-24-2019, 08:59 PM
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Originally Posted by jvoisel View Post
Any two marine deep cycle batteries will be fine. I run two AC Delco 27's and can fish 2-3 days without charging. They were ~100 each
so the specs of the battery I chose are good enough?
Old 10-25-2019, 02:04 AM
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The batteries that you mentioned will work fine. FWIW, I never get dual purpose ones though i.e. troll and start. I also lean toward getting the largest size that can fit as you get extra capacity for just a bit more weight.

From a quick search that I did on Google
Some common battery size codes used are: (ratings are approximate)
U1 34 to 40 Amp hours
Group 24 70-85 Amp hours
Group 27 85-105 Amp hours
Group 31 95-125 Amp hours
4-D 180-215 Amp hours
Old 10-25-2019, 04:25 AM
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I forget which 2 batteries I run for my 80lb motor on a 22ft bay boat.( 27 group) And I use my motor a lot. But they are not super expensive and doing fine @ about 2 years old. I think the biggest thing is people don't maintain the NON Maintenance free and keep them charged there-by causing premature failure. If you don't get maintenance free just check them every couple months. Also think think an on-board charger is worth every penny. Mine is plugged in for a few hrs when I get back and I ask for it to be charged up over night before I show up.
Old 10-25-2019, 07:44 AM
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Default Lithiums

Any one have any experience with Lithium batteries, I am looking for pros and cons besides cost?
Old 10-25-2019, 05:23 PM
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I work with large lithium batteries. Getting the right battery and charger and setting up the system is critical. There are different technologies that offer different power densities as well as safety challenges. If you can look for UL listed batteries. Battery safety is an important part of the decision, cheap batteries bring higher risks and if one has a thermal runaway say goodbye to your boat. A fire extinguisher will not put out the fire. Generally they don’t like to get wet, hot or shaken. Done right they can be great. Don’t go cheap, you get what you pay for.
Old 10-25-2019, 08:19 PM
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I ran the oriely auto “captain” batteries on my 24v terrova for 3 years and they were amazing. Cheap at like $80 bucks a piece. It says it’s a starting battery but it held my 24v for up to 5-6hrs just fine. It’s not recommended to run a starting battery but I had the batteries in the boat for 3 plus years and it did fine. Recharged them on minn Kota 2 bank charger after every use

Last edited by Wickedfisha; 10-25-2019 at 08:33 PM.
Old 10-25-2019, 10:34 PM
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When looking for lead-based batteries buy the largest batteries (Ah) you can fit, and look for batteries with a stated 50% DOD. (DOD tells you how much they can be discharged.) Always charge them as soon as you can, always charge them after use no mather how long you where using them. If in doubt Google «sulfatation».

You want large batteries both for the capacity, but also for power and longevity. The chemistry in the battery limits how much amps it can deliver instantaniously, which again limits the power on your TM. Buying a TM with a lot of pull and connecting a small battery is a waste of money, as that small battery will not be able the deliver the short-term 56A that a powerful TM typically has as maximum draw. The bigger the battery, the longer it can deliver those high amps.

As for longevity the larger the better. Even if your battery is 50%DOD it will still live longer the fewer times you push that limit.

Lifepo4 is offcourse the ideal TM-battery, and in the long run most likely also the cheapest option as in the real world they usually deliver a lot more cycles than a lead-based battery will. (Since in the real world, we tend to discharged past DOD, we forget to charge and leave the batteries depleted a few days before remembering, we don’t check the acid etc etc) They also save a lot of weight, saving you fuel. But the initial cost is substantial.

Last edited by Team Colibri; 10-26-2019 at 08:10 AM.
Old 10-26-2019, 05:15 AM
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I run 2 size 31s with my Minn Kota 80. May be overkill but they run forever..... and that's on a 17' boat!
Old 10-26-2019, 10:37 AM
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Best battery for my money is Interstate group 31 MHD. Zero maintenance and about $150 each. Mine are going on year 5.

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