Original AC Delco batteries are typically the AGM (glass matt) they tend to last much longer then aftermarket liquid style.
We build all the local police and sheriff vehicles majority of them run 2 yellow top optimas because of the abuse. But they are pricey and ive seen those come back after just a few months..
I just finally replaced my agm factory battery and just opted to go with a Everstart Maxx its 800cca.
From my past experience I've seen new batteries go bad and I've seen batteries last for years. there istt really much rhyme or reason just kinda hit or miss.
You can take your car up and have a load test done on it to check it out. But my factory batt was testing about 50-75ca lower then spec so I wasnt waiting for a snowy freezing Michigan morning to have a no start condition
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