You base "proof" on one anecdotal event? Good grief!
I've seen a few conventional lead-acid batteries last 10 years - but at least I realize they are exceptions and not the rule.
AGM battery claims are mostly hype for use in cars and light trucks, and it appears you fell for it. I've seen many miserable failures with them, more then with conventional lead acid batteries.
AGMs offer one big advantage - they are spill proof. There are applications where that is important (like in a race car or space-craft). They are also more vibration resistant as compared to SOME conventional batteries, but not all.
The losing side of AGMs is . . . #1 they fry much easier then a conventional battery if accidentally overcharged, and #2 they cost a lot more.
I've been averaging, on my own diesel trucks and tractors around 6 years for my conventional batteries. But, they go bad slowly, and once removed I often stick them in old tractors and keep using. My IH B-275 diesel has a NAPA battery that is now 9 years old and still working - although it loses a charge faster then it used to. Will go dead in one week if I don't run the tractor.
Right now - if I buy a new conventional lead acid battery for my truck - BCI # 75 :
Conventional BCI # 75:
850 CCA, RC - 100, cost $120, and has a warranty of - free replacement for 40 months and prorated for 108 months.
650 CCA, RC - 95, cost $75, and has a warranty of - free replacement for 18 months and prorated for 75 months.
Optima AGM BCI # 75 (absorbed glass mat)
620 CCA, RC-100 Yellow-top, cost $200, and has a warranty of - free replacement for 36 months and no prorated warranty.
720 CCA, RC-90 Red-top, cost $160, and has a warranty of - free replacement for 36 months and no prorated warranty.
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Today's Featured Article - History of the Nuffield Tractor - by Anthony West. The Nuffield tractor story started in early 1945. The British government still reeling from the effects of the war on the economy, approached the Nuffield organization to see if they would design and build an "ALL NEW" British built wheeled tractor, suitable for both British and world farming.
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