Hey, my Duralast group 27 battery was dying so I replaced it with a Costco battery. The thing is that Costco recomends a group 24 size battery which is smaller. The CCA is still well above the OE battery but will life be shorter since it is under more strain? Either way $50 for a 3 year free replacement battery isn't bad. Sounds MUCH better than the old battery. Anyone else think its ridiculous how much battery mark up is? Johnson controls makes like 90% of all car batterys. ALL employees get optimas for $50 and others for next to nothing. The only time I wish I still worked for them is when I buy a battery. Whoa a little off topic there.