Skip to Main Content
Sam's Club
Sam's Club
All Departments
All Services
Customer reviews for Duracell Marine Deep Cycle Battery, Group Size 31 for
Duracell Marine Deep Cycle Battery, Group Size 31
2.5 out of 5 stars
stars
50 ratings48 reviews
  1. 5 stars30% (15)
  2. 4 stars6% (3)
  3. 3 stars4% (2)
  4. 2 stars6% (3)
  5. 1 star54% (27)
Sort by |
Showing 1-10 of 48 reviews
Jul 19, 2026
Reviewer name: mark
5 out of 5 stars
5 out of 5 stars review

Verified Purchase

Maintenance battery - requires checking water

Perfect to replace a battery operated back up for a sump pump that requires a maintenance battery

Helpful?0YUNXBZEVMH013883303574
Jun 2, 2018
Reviewer name: John
5 out of 5 stars
5 out of 5 stars review

Verified Purchase

Trolling motor battery

Bought battery for trolling motor, seemed to work fine. Hard to tell how much actual capacity, but used trolling motor for 5-6 hours.

Helpful?0YUNXBZEVMH013883303574
Apr 5, 2026
Reviewer name: KEVIN
5 out of 5 stars
5 out of 5 stars review

I have 20 of these installed since January 2019 on an off grid cabin. 7 years of constant use later they have lost only 35% of their capacity. I power a 8k BTU AC in the summer just fine. 3.2kw solar charging MAKE SURE YOU TREAT THEM RIGHT BY NOT DISCHARGING BELOW 50% AND KEEP THEM FILLED WITH DISTILLED WATER.

Helpful?0YUNXBZEVMH013883303574
Apr 2, 2021
Reviewer name: Chucky Tuna
5 out of 5 stars
5 out of 5 stars review

So Far, So Good

I purchased a pair of these batteries 3 years ago for my 24 volt trolling motor, which I use seasonally 6 months out of the year. The rest of the year the batteries are stored and disconnected from my onboard charger. As a previous reviewer commented, the batteries are a bit "thirsty" and need to be topped-off with distilled water periodically. I'm on my trolling motor almost continually, I recharge after every outing, and the batteries are always on my charger when not in use (with the exception of when they are stored for the 6 month off-season). I expected these deep cycles to last about 3 years, which they have. I'll be anxious to see if I can get a 4th . . . or maybe even a 5th out of them.

Helpful?0YUNXBZEVMH013883303574
Nov 21, 2025
Reviewer name: DAVID
5 out of 5 stars
5 out of 5 stars review

Have had 2 of these installed on my camper going on 4 years. They have been fantastic, they stay installed all winter while the camper is plugged in with no issues. 100 watt solar panel when camping with no concerns whatsoever, always have plenty of power. the furnace blower can go all weekend without concerns of batteries getting to low even when cloudy out. recommend these, for the price they can't be beat!!

Helpful?0YUNXBZEVMH013883303574
Apr 18, 2021
Reviewer name: Joetechno
4 out of 5 stars
4 out of 5 stars review

95% of people who buy this battery make this mista

These batteries are made with recycled lead, which is not 100% pure, these batteries come 3/4 charged, you first have to charge them to 100% or float them for 24 hrs. Then unscrew the caps, to top battery to the rings, DO NOT USE WATER, these batteries are new, if you add water for the first time you will reduce the charge capacity, the first fill has to be battery acid mix, you can buy this any auto store, buy a container for a motorcycle battery, top off each cell to the ring, now after using battery and cycling charging it, if battery is low on fluid NOW USE ONLY WATER TO FILL THE BATTERY, people all make the same mistake by topping off the new battery with water, by doing that you dilute the acid mix which then shortens the battery life

Helpful?0YUNXBZEVMH013883303574
Sep 26, 2020
Reviewer name: Dean
2 out of 5 stars
2 out of 5 stars review

Keeps failing

I just don't understand. I purchased 3 of these a few years ago. Luckily I kept the receipts because all 3 failed around 10 months. The replacements failed around 10 months also. So I am on my 3rd set of these. They all didn't fail at the same time. But they were a couple of weeks apart. These are properly maintained used on a boat with onboard charger. I mean I guess I'll keep using them and getting free replacements every 10 months but it is just such a pain. If anything last longer than a year I will be replacing with something different for sure.

Helpful?0YUNXBZEVMH013883303574
May 28, 2021
Reviewer name: Sonny
1 out of 5 stars
1 out of 5 stars review

Junk

These are terrible batteries. They come partially charged and very low on acid. I had to add a whole Qt of acid in it then put on charger. Let's see how long it lasts. I did not know about these batteries being low on acid. I have never had one of these batteries last more than 15 months. I suggest you load test your battery before your year of warranty is up and exchange it under warranty if questionable.

Helpful?0YUNXBZEVMH013883303574
Aug 26, 2024
Reviewer name: Mike in KC
1 out of 5 stars
1 out of 5 stars review

No good for a trolling motor.

I purchased these less than a month ago to replace a pair of 2018 Duracell AGM batteries, same size, group 31. These performed WORSE than the 6 year old batteries that have had hundreds of cycles through them. Will not power my trolling motor for more than 4 hours on the water. The AGM's lasted for two days. Sam's won't take these back for an exchange or warranty as they "test" good but are terrible when on the water.

Helpful?0YUNXBZEVMH013883303574
Jun 25, 2020
Reviewer name: Philantfon
1 out of 5 stars
1 out of 5 stars review

14 months on 12 month full replacement.

I don’t like doing negative reviews but when you warranty a product for 12 months and they won’t recharge at 14, seems like you got us right where you want us. I worked at an AC Delco battery plant when things were still manufactured in the US and everyone in the plant took pride in what we put out to the consumer. I’m so disappointed. These Duracell batteries were well maintained and still killed over. Sad. I pride myself in reading reviews, wading through negative ones to find quality products, well now these batteries have 9 positive and 10 negative. That speaks volumes.

Helpful?0YUNXBZEVMH013883303574