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.

I purchased two of these for my class A motor home. I hooked them in parallel which replaced the two wet cell batteries. Now I do not worry about checking water levels. The first day I installed them I ran the motor homes ventilation fan for about 6 hours and the battery charge panel showed that they were still close to fully charged.

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.

Purchase this battery March of 2014 and it's been connected nonstop on a solar system with 200 watts of solar power. The winter time it sits for a couple months on the trickle charge. now on the 6th year it's still provides a decent amount of power for my 300w pure sine wave inverter. I'm going to give it another year or two but I'm going to buy another of the same battery simply because of how the dependable and long lasting this has been. Also note this batteries sits out in the elements for the past 6 years and has showed very little sign of any kind of plastic or UV degrade.

I purchased 4 of these to use in my motorhome. $800 worth of batteries. The coach did not even get used. I installed the batteries 13 months ago in my motor home as starting batteries. The coach was never on the road and was only in storage with a trickle charge on the batteries the whole time. One month after the 1 year warranty expired they are shot. Sams will do nothing about it. I am going to do a youtube video and post it later.

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.

Purchased 2 for my RV. Worked great the first few months then would not accept a full charge after 9 months. Returned for a full refund and then purchased 2 more. If these don't perform, I'll return and go with another brand. I've used other brands of AGM baterries in my RV and boat for almost 15 years and have had a couple of AGM batteries last over 10 years. Thank goodness for the 18 month warranty.

Purchased 3 of these in August 2019, to replace three lead acid batteries that were more than 6 years old. They were used for house batteries in 2006 Winnebago Vectra. Seemed fine for two months of use, but after storing the rv for less than one month indoors, in a heated shop, on a smart trickle charger they are completely dead, will not take a charge. Voltage for each of the three is at .02 volts. Will pull them out today and return them. I did some research before installing them, and understood that these are to be charged and maintained as you would lead acid.

I use this battery to power an inverter for back up on my sump pump. Boaters and RV owners rave about the cost as it is 25% less then any AGM battery of this size, on the market. Sears offers a 24 month warranty, Sam's an 18 month. But for the savings, well worth the difference. Be prepared for a $15 - $16 core charge if you have no old battery to turn in. This is common practice for all car batteries no matter where they were purchased.

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.