Trolling Motor Battery Assistance Please!

Hey guys, good morning. I know this has been discussed a thousand times so I apologize. I have read so many forum boards on this issue. I want to ask you trolling pros.

So I will be buying a 45-55 thrust TM in a few weeks. I troll around a medium size lake and sometimes run it full blast for around 2-3 hours to move around the lake.

This is the battery I am looking at for $148.42
Duracell Ultra BCI Group 31M Deep Cycle Marine & RV Battery - SLI31MDC at Batteries Plus Bulbs

Duracell Ultra BCI Group 31M Deep Cycle Marine & RV Battery
105ah
12V
Lead Acid: Flooded
Marine Cranking AMPS 800
Cold Cranking AMPS 650
Terminal is Threaded Post SAE/M8
Weight: 59 lbs

I am also looking at their Duracell Marine Battery charger:
Duracell Ultra Marine Chargers at Batteries Plus Bulbs

Your thoughts? I am totally new to this.

Or this charger? https://www.duracellpower.com/collections/car-battery-chargers/products/2-amp-battery-charger-maintainer-1

Here is how the battery size comes into play. 1) locate the amp hour rating on the battery. 2) locate the trolling motor amp draw. 3) divide the battery amp hour by the motor amp draw. 4) this is how long the battery will last on a constant draw on high.

example:
100 amp hour rated battery / 20 amp draw = 5 hour run time

Look up this battery and see if you have a local location that sells them. They are hard to find but a great battery. Can’t give you pricing because you have to get it from dealer.
US 31DC XC2 - U.S. Battery Mfg. Co.

I have 3 of those batterys. they work fine. however, I just checked the price on line and they come up as 121....you also get 10 percent off if you order on line and pick up at a store....as for a battery charger, if you are looking for an onboard charger, I only buy minnkota these days..never had a problem..

No idea about the battery, but you can buy the same one at Sam's for 99.00.

I have tried twice with batteries plus batteries and twice had to replace right after the warranty expired. From working on battery powered equipment for years, Trojan batteries hold up the best. Just my 2cents

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Originally Posted by tlefire

No idea about the battery, but you can buy the same one at Sam's for 99.00.

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This. It's the same battery for less than $100. I am still a big Deka Marine Master fan made by East Penn, but Duracells are now made by East Penn at a lower price point. The Trojan SCS225 flooded deep cycle has similar specs as the US Batteries that Cray mentioned if you have a golf cart dealer close to you that sells Trojan batteries. Either one of those is a premium flooded deep cycle battery.

The Walmart Everstart Maxx marine batteries are now that same battery. Better price, twice the warranty and easier access for warranty replacement.

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Originally Posted by CatFan

The Walmart Everstart Maxx marine batteries are now that same battery. Better price, twice the warranty and easier access for warranty replacement.

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Walmart has a group 31?

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Originally Posted by TimberTalker

Walmart has a group 31?

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No, but they have the Group 29 which is pretty close.

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Originally Posted by TimberTalker

Walmart has a group 31?

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They’ve always had a 29 which is essentially the same thing. They’ve recently switched to East Penn around here, which makes a 31. JCI makes 29s. Exide and East Penn make 31s

thanks guys I was just starting to look for couple replacement TM batteries. Perfect timing!

can someone explain the size 34 to me please , I know the sizes seem to go up in length, and height and weight. like a size 24 is approx. 10 L X 7 W X 9 H approx. weight 45 lbs and a size 27 is approx. 12 L x 7 w x 9 h. approx. weight 54 lbs and a size 31 is about 14 in length, approx. weight 59 lbs so when you come to a size 34 the size drops to 10 L x 7 w x 8 H . APPROX WEIGHT 36 LBS. Why does this seem not to confirm with other sizes ? I bought a new T M and want to run twin batteries but am restricted for space , size 24 and 34 are approx. the same size in length, in this case size does matter, even though I won't admit this to the wife. the 2 inches difference in length will fit in my battery space, 12 inches is to long, so with bigger size batteries , more weight, more length, you get longer run time usually, [ more plates more power ] so why a smaller size 34 ?
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Originally Posted by shaved ice

can someone explain the size 34 to me please , I know the sizes seem to go up in length, and height and weight. like a size 24 is approx. 10 L X 7 W X 9 H approx. weight 45 lbs and a size 27 is approx. 12 L x 7 w x 9 h. approx. weight 54 lbs and a size 31 is about 14 in length, approx. weight 59 lbs so when you come to a size 34 the size drops to 10 L x 7 w x 8 H . APPROX WEIGHT 36 LBS. Why does this seem not to confirm with other sizes ? I bought a new T M and want to run twin batteries but am restricted for space , size 24 and 34 are approx. the same size in length, in this case size does matter, even though I won't admit this to the wife. the 2 inches difference in length will fit in my battery space, 12 inches is to long, so with bigger size batteries , more weight, more length, you get longer run time usually, [ more plates more power ] so why a smaller size 34 ?
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Here is some info that hopefully will help you.
Group 34 Batteries - Dimensions, Features and Recommendations

thanks cray that was very helpful !!!

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Originally Posted by CatFan

The Walmart Everstart Maxx marine batteries are now that same battery. Better price, twice the warranty and easier access for warranty replacement.

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Same here, easy warranty replace if needed, Walmarts are everywhere.
Mine is performing just fine.

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Originally Posted by shaved ice

can someone explain the size 34 to me please , I know the sizes seem to go up in length, and height and weight. like a size 24 is approx. 10 L X 7 W X 9 H approx. weight 45 lbs and a size 27 is approx. 12 L x 7 w x 9 h. approx. weight 54 lbs and a size 31 is about 14 in length, approx. weight 59 lbs so when you come to a size 34 the size drops to 10 L x 7 w x 8 H . APPROX WEIGHT 36 LBS. Why does this seem not to confirm with other sizes ? I bought a new T M and want to run twin batteries but am restricted for space , size 24 and 34 are approx. the same size in length, in this case size does matter, even though I won't admit this to the wife. the 2 inches difference in length will fit in my battery space, 12 inches is to long, so with bigger size batteries , more weight, more length, you get longer run time usually, [ more plates more power ] so why a smaller size 34 ?
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It’s purely coincidence that sizes increase for 24, 27, 29 and 31