My Kirkland battery bought 5/24/14 was totally dead this AM. Has been fine and driven every day until today. Manufacture date on battery is 11/13. I will get a free replacement since I haven't quite had it 2 years. Costco told me, after 2 years, they will prorate it. I will get my free replacement but not sure I want another Costco battery. Maybe Interstate will be better. I hope so!