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"Back in the old days" batteries had much thicker plates, and they were tougher, but less cold cranking power. Batteries would just get weaker and weaker, as you would notice the starter spinning slower.
Modern batteries have a much thinner plate, but more of them. Now typically batteries are fine one moment, and just dead a minute later, and you can't even jump start the car as the batteries have shorted internally.
Batteries have a magic sense to know when the most inconvenient place and time possible for the owner for the battery to fail. I have just started replacing my batteries after the pro-rated warranty has expired by a year. I may waste a few more months of use, but saved myself the annoyance of a dead battery miles from home, on a Sunday night in the rain while in nice clothes.
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Glen
49 Year member of the Porsche Club of America
1985 911 Carrera; 2017 Macan
1986 El Camino with Fuel Injected 350 Crate Engine
My Motto: I will never be too old to have a happy childhood!
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