I've had great luck with Deka deep cycle AGM's sold by Sam's Club. Had a pair of paralleled AGM grp31 on my travel trailer that lasted almost 5 years. They were bought in the east as Duracell. They died finally on a trip out west and oddly Sam's doesn't seem to sell deep cycle AGM's in the west- at least I couldn't find in in checking with multiple Sam's Clubs. Ended up getting 2 golf cart batteries, not what I wanted, but... We lost an OEM Panasonic in our FJCruiser and it was replaced with a Sam's Club Eveready AGM bought in Grand Junction CO Scroll forward almost 3 years and it died- totally my fault- went away for several weeks and mistakenly plugged in a phone charger rather than the solar maintainer. Toted it into my local East Coast Sam's with the West Coast receipt and they initially balked at replacing it as they sold Duracell and not Eveready.. When I showed them the batteries, other than the labels, were identical they replaced it.