I have had zero luck with AGM batteries. I have tried both Optima and Diehard (Odyssey) and both crapped out in 2 years of pampered use. I replaced the last one with a Duracell from Sams at less than half the cost and it has been going strong for 6 years. Granted, I have always removed my batteries and throw them on the appropriate maintainer for the winter: https://www.amazon.com/CTEK-40-206-5...67516060&psc=1
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71 Formula 433, Splayed cap 400 block, 4" stroke Scat forged crank, 6.8 Eagle rods, custom Autotec pistons. SD 295 KRE D ports, Old faithful hybrid roller, Torker II, Holley Sniper Stealth, Tribal Tubes, TKO 600, 3.73 Eaton posi.
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