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 - Usin Your Implements: Bucket Loader - by Curtis Von Fange. Introduction: Dad was raised during the depression years of the thirties. As a kid he worked part time on a farm in Kansas doing many of the manual chores. Some of the more successful farmers of that day had a new time saving device called a tractor. It increased the farm productivity and, in general, made life easier because more work could be done with this 'mechanical beast'. My dad dreamed that some day he would have his own tractor with every implement he could get. When he rea
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