I replaced my OEM with a Duralast Gold from Autozone and it wasn't more than a year when I started noticing slow starts. As far as I can tell there really isn't a substitute to the OEM batteryMy current one is supposed to be 600 CCA. It tested 312 and 358 at the two places I went today.
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Smart. How much are OEM batterys?I'm going to try to fight with CarQuest/Advanced Auto to see if I can get cash back instead of a replacement if the CCA doesn't improve after I get it on a charger. Voltage this morning after sitting overnight was 12.40 and after commuting about 30 minutes to work was at 12.50 (with the car off). With the car running, I'm seeing about 13.55 (with A/C and lights on).
If they go for the cash refund, I'll pick up another OEM battery. The OEM lasted at least twice as long as the last two I've had.