just returned(and they gave me a new one) a Diehard Platinum 34M today, it died at around 2.5 years. I have a real Odyssey(1700) in my 100 series, its almost 10 years old. For the most part I am going back to normal batteries like the Kirkland brand(I have one in each 45 that are 8 years old) I have another Diehard that was bought a month after the 1st in my 60.....expecting it to die soon(hopefully before 3 years)
bitching aside, I think the key to the AGM battery life is use, if you use it(like in a daily driver, like my 100) I think they last longer than say a weekend 40, even if hooked up to a battery tender. I also think the Diehards are not as good as the real Odysseys, pretty sure I will never buy one again. I would buy another Odyssey if needed
the stainless trays are great, I have a pair in my FJ60 been there for maybe 10 years
when I did duel bats in my 1982 40 10+ years ago, I did not want to move stuff around or drill holes, so I took a stock tray and made it bigger so I could fit 2 of the smaller 1200 Odyssey in it. Set up worked great, think the 1st battery lasted 6-7 years, I replaced it, then the other original died about 2 years latter, that's when I went to the single Diehard 34......like I said it lasted just 2.5 years(and I drive the 40 allot and it has a tender on it fairly often) Now it has big Kirkland marine in it. Not sure what I am going to do with the group 34 I got as a replacement today...I may put it back in the 40 or ?
this is what I had in the 40
stock tray compared to enlarged, my only welding project ever.....dont laugh. Tray is still in there
AGM true maintenance free sealed technology that is not craptastic/Optima.
The Sears DieHard version can often be had for 20% off.