I installed three Duracell AMG 31 group batteries in my boat in May. One dedicated cranking & dash electronics, and two in series to power my 24V trolling motor. All hooked to a 3x10amp on-board charger/maintainer. Over 300 hours of use, including multiple days of hard use without charging and they have been flawless. Could not be more pleased.

Last year I modified my truck camper to hold 4 of these. I dry camp on the beach in NJ and these provide the power I need for a long weekend. Remember AGM batteries really shouldn't be discharged more then 50% so remember to calculate that in your total amp usage. They are also heavy so factor that in as well. I was rebuilding the side of my camper so I just framed it accordingly. I upgraded my converter/charger to a 3 stage type with an AGM setting. I also have a honda 3000iu generator with me and 15 gal of gas so I'm pretty much ready for anything.

Recently built a new vessel, commercially shopped around for batteries, wound up getting these from Sam's! I am using 3 sets of them linked in series for 24VDC and 2 for 12V auxiliary engine starting. Highly reccommended. Hint: These batteries need the new style battery chargers that will not overcharge them.

Bought 4 of these to replace flooded-type (wet cell) deep cycle batteries - the four are wired parallel to support a power inverter that I use to run the 110V air conditioning on my boat. Things were always finicky with the wet cells and in Okla. heat, required constant checking/filling water. This is a GREAT PRICE for this size AGM marine battery -- if it holds up as it should. So far (several weeks) working GREAT - no problems. Much better choice for a boat that sees some rough chop on a big lake.

I have several Duracell AGM group 31 , 27 and 24 . They work very well even 7 years later. Use a high amp Smart Charger and don't drain the battery dead . I have had some of these last me 10 years. All that being said converting to PO4 Lithium is much better in the long run.

Just replaced 2 Duracell group 31 AGM Batteries on my boat the manufacturers date code was D3 on both batteries April 2013. 1 of the old batteries is still holding 12.28 volts and 480 MCA , the other sadly is only 10.56 volts and 0 MCA. These batteries were maintained with a MinnKota 3 bank on board charger designed for AGM Batteries. I wish they had lasted longer but they did outlast every other battery I have tried, 7 years is a long time with all the electronics I use on my boat.

I bought a pair of these 3 years ago. We do a lot of dry camping and use the batteries heavily, keeping a Dish Sat receiver on 24 hrs / day. Charge up 2 or 3 times a day with a Honda gen, can easily go 10 days w/o hookups. One other brand is better, costs $400 elsewhere. I'll buy these again if they fail before we do.

I have two of these in my boat running an 80lb 24v trolling motor. I've used them since early in the year. We fish Lake Taneycomo (the tailwaters of Tablerock dam). Several 6 hr trips I've had to fight current with the trolling motor running constantly and averaging maybe 40% of full power. This has nowhere near drained these batteries. They recharge very quickly with my onboard charger. I'm very pleased with them and expect them to last several years.

I purchased 4 of these to use as a house bank on my boat. While AGM batteries are good for being used as deep cycle batteries, it is still important not to discharge them more than 50%. The greater the discharge, the lower amount of times they can cycled. Prior to this purchase of AGM's I used flooded deep cycle batteries, group 27. I would remove those batteries during the winter to keep them in my garage and put a charger on them once a month. Theses AGM batteries are roughly 80 pounds each; about 15-20 pounds heavier than the deep cycle. AGM's do not self-discharge nearly the amount of flooded wet cell batteries. I now keep the batteries in the boat over winter and saves me a lot of grief. Come spring when I have AC power, I can use the battery charger to top them off. The first year I was surprised how very little charging they needed. Keep in mind that I am charging all 4 at once; they are connected in parallel. My remote charging panel showed 40 amps (I have a 40 amp, 3 stage charger# and within a minute or so dropped to 20 amps #roughly 5 amps per battery#. 10 to 15 minutes later the charging current was down to 10 amps #2.5 amps per battery). So letting the batteries set for 5-6 months over winter took less than 15 minutes to charge. I expect to get at least 7-10 years out of these batteries versus 4-5 years for the flooded deep cycle. Treat these batteries correctly, no more than 50% discharge, good 3 stage charger, and battery temperature sensor, and they should be trouble free for many years. The only gripe I have is the totally lack of information on the voltages for recharging them. I set my charger to the AGM mode. It would be great if the manufacture specified what the voltage should be and specified battery temperatures.

My 2011 Itasca Sunova Model 33C motorhome needed new coach batteries. Based upon recommendations from other RV owners I bought two of these batteries. They were the biggest, heaviest, highest-capacity, deep-cycle batteries that would fit in my motorhome's battery compartment. They're connected in parallel. With a full charge, they'll power my coach, its lights and my 1,000-watt inverter for much longer than the two smaller batteries that were installed at the factory. The sealed design eliminates spills and having to maintain fluid levels.